### 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
collections = context.CLIARGS['args']
        no_deps = context.CLIARGS['no_deps']
        download_path = context.CLIARGS['download_path']
        requirements_file = context.CLIARGS['requirements']
        if requirements_file:
            requirements_file = GalaxyCLI._resolve_path(requirements_file)
        requirements = self._require_one_of_collections_requirements(
            collections, requirements_file,
            artifacts_manager=artifacts_manager,
        )['collections']
        download_path = GalaxyCLI._resolve_path(download_path)
        b_download_path = to_bytes(download_path, errors='surrogate_or_strict')
        if not os.path.exists(b_download_path):
            os.makedirs(b_download_path)
        download_collections(
            requirements, download_path, self.api_servers, no_deps,
            context.CLIARGS['allow_pre_release'],
            artifacts_manager=artifacts_manager,
        )
        return 0
    def execute_init(self):