### 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
flash("Missing file or syntax error.", 'error')
            return redirect(self.get_redirect())
        else:
            suc_count = fail_count = 0
            for k, v in variable_dict.items():
                try:
                    models.Variable.set(k, v, serialize_json=not isinstance(v, str))
                except Exception as e:
                    logging.info('Variable import failed: %s', repr(e))
                    fail_count += 1
                else:
                    suc_count += 1
            flash(f"{suc_count} variable(s) successfully updated.")
            if fail_count:
                flash(f"{fail_count} variable(s) failed to be updated.", 'error')
            self.update_redirect()
            return redirect(self.get_redirect())
class JobModelView(AirflowModelView):
    """View to show records from Job table"""
    route_base = '/job'
    datamodel = AirflowModelView.CustomSQLAInterface(BaseJob)  
    class_permission_name = permissions.RESOURCE_JOB
    method_permission_name = {
        'list': 'read',
    }
    base_permissions = [
        permissions.ACTION_CAN_READ,
        permissions.ACTION_CAN_ACCESS_MENU,
    ]
    list_columns = [