### Summary

I'm trying to optimise my builds by avoiding unnecessary downloads.
ansible-galaxy install always downloads the latest version even if the existing collection already meets the requirements. This behaviour appears to be consistent with the documentation (https://docs.ansible.com/ansible/latest/galaxy/user_guide.html#installing-an-older-version-of-a-collection), but why has it been implemented to always download ?


e.g. I have
```
# /usr/local/lib/python3.8/site-packages/ansible_collections
Collection                    Version
----------------------------- -------
amazon.aws                    3.5.0  
...
```
and requirements.yml
```
---
collections:
  - name: amazon.aws
    version: '>=1.5.0'
```
if I run ansible-galaxy install -r requirements.yml I get amazon.aws 6.1.0 installed, even though 3.5.0 already meets my 1.5.0 requirement. I would expect nothing to happen because my requirements were already met.

### Issue Type

Feature Idea

### Component Name

ansible galaxy

### Additional Information

People who like the existing behaviour could perhaps use the recently added --upgrade switch to continue to get the upgrade to the lastest version.

### Code of Conduct

- [X] I agree to follow the Ansible Code of Conduct
"The --signatures option and --requirements-file are mutually exclusive. "
                    "Use the --signatures with positional collection_name args or provide a "
                    "'signatures' key for requirements in the --requirements-file."
                )
            requirements_file = GalaxyCLI._resolve_path(requirements_file)
            requirements = self._parse_requirements_file(
                requirements_file,
                allow_old_format=False,
                artifacts_manager=artifacts_manager,
            )
        else:
            requirements = {
                'collections': [
                    Requirement.from_string(coll_input, artifacts_manager, signatures)
                    for coll_input in collections
                ],
                'roles': [],
            }
        return requirements
    
    
    
    def execute_role(self):
        """
        Perform the action on an Ansible Galaxy role. Must be combined with a further action like delete/install/init
        as listed below.
        """
        
        pass
    def execute_collection(self):