### Apache Airflow Provider(s)

sendgrid

### Versions of Apache Airflow Providers

I'm running this version of airflow locally to test the providers modules. I'm interested in sendgrid, however it doesn't show up as a conn type in the UI making it unusable.  

The other packages I've installed do show up.

```
@linux-2:~$ airflow info

Apache Airflow
version                | 2.1.2                                              
executor               | SequentialExecutor                                 
task_logging_handler   | airflow.utils.log.file_task_handler.FileTaskHandler
sql_alchemy_conn       | sqlite:////home/airflow/airflow.db        
dags_folder            | /home/airflow/dags                        
plugins_folder         | /home/airflow/plugins                     
base_log_folder        | /home/airflow/logs                        
remote_base_log_folder |                                                    
                                                                            

System info
OS              | Linux                                                                                                                                                                                   
architecture    | x86_64                                                                                                                                                                                  
uname           | uname_result(system='Linux', node='linux-2.fritz.box', release='5.11.0-34-generic', version='#36~20.04.1-Ubuntu SMP Fri Aug 27 08:06:32 UTC 2021', machine='x86_64', processor='x86_64')
locale          | ('en_US', 'UTF-8')                                                                                                                                                                      
python_version  | 3.6.4 (default, Aug 12 2021, 10:51:13)  [GCC 9.3.0]                                                                                                                                     
python_location |.pyenv/versions/3.6.4/bin/python3.6                                                                                                                                      
                                                                                                                                                                                                          

Tools info
git             | git version 2.25.1                                               
ssh             | OpenSSH_8.2p1 Ubuntu-4ubuntu0.2, OpenSSL 1.1.1f  31 Mar 2020     
kubectl         | Client Version: v1.20.4                                          
gcloud          | Google Cloud SDK 357.0.0                                         
cloud_sql_proxy | NOT AVAILABLE                                                    
mysql           | mysql  Ver 8.0.26-0ubuntu0.20.04.2 for Linux on x86_64 ((Ubuntu))
sqlite3         | NOT AVAILABLE                                                    
psql            | psql (PostgreSQL) 12.8 (Ubuntu 12.8-0ubuntu0.20.04.1)            
                                                                                   
                                                                                                                                                                                                                        

Providers info
apache-airflow-providers-amazon   | 2.0.0
apache-airflow-providers-ftp      | 2.0.1
apache-airflow-providers-google   | 3.0.0
apache-airflow-providers-http     | 2.0.1
apache-airflow-providers-imap     | 2.0.1
apache-airflow-providers-sendgrid | 2.0.1
apache-airflow-providers-sqlite   | 2.0.1

```

### Apache Airflow version

2.1.2

### Operating System

NAME="Ubuntu" VERSION="20.04.2 LTS (Focal Fossa)" ID=ubuntu ID_LIKE=debian PRETTY_NAME="Ubuntu 20.04.2 LTS" VERSION_ID="20.04" HOME_URL="https://www.ubuntu.com/" SUPPORT_URL="https://help.ubuntu.com/" BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/" PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy" VERSION_CODENAME=focal UBUNTU_CODENAME=focal

### Deployment

Other

### Deployment details

I simply run `airflow webserver --port 8080` to test this on my local machine. 

In production we're using a helm chart, but the package also doesn't show up there prompting me to test it out locally with no luck. 

### What happened

Nothing

### What you expected to happen

sendgrid provider being available as conn_type

### How to reproduce

run it locally using localhost

### Anything else

nop

### Are you willing to submit PR?

- [X] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

airflow/www/views.py
payload.append(
                {
                    'dag_id': dag_id,
                    'active_dag_run': active_dag_runs,
                    'max_active_runs': max_active_runs,
                }
            )
        return wwwutils.json_response(payload)
    def _mark_dagrun_state_as_failed(self, dag_id, execution_date, confirmed, origin):
        if not execution_date:
            flash('Invalid execution date', 'error')
            return redirect(origin)
        execution_date = timezone.parse(execution_date)
        dag = current_app.dag_bag.get_dag(dag_id)
        if not dag:
            flash(f'Cannot find DAG: {dag_id}', 'error')
            return redirect(origin)
        new_dag_state = set_dag_run_state_to_failed(dag, execution_date, commit=confirmed)
        if confirmed:
            flash(f'Marked failed on {len(new_dag_state)} task instances')
            return redirect(origin)
        else:
            details = '\n'.join(str(t) for t in new_dag_state)
            response = self.render_template(
                'airflow/confirm.html',
                message="Here's the list of task instances you are about to mark as failed",
                details=details,
            )
            return response
    def _mark_dagrun_state_as_success(self, dag_id, execution_date, confirmed, origin):