fix: make repository key optional in galaxy.yml

[rivv0]

Updated the galaxy.json schema used by ansible-lint to remove the repository key from the list of required properties for galaxy.yml. According to the [Collection Galaxy metadata structure], the repository key is optional and should not trigger a schema violation.

• ansible-lint will no longer fail with a schema error when repository is missing from galaxy.yml.
• Developers will receive a warning (if the new rule is enabled) rather than a blocking error.
• Improves compatibility with the official Ansible Galaxy metadata specification and the VS Code Ansible extension.

Fixes: #4793

[alisonlhart]

@rivv0 Thanks for this contribution! It looks great. We just need the tests updated to accommodate the change. Can you make the needed changes (add LICENSE to fixtures) and then we can get this merged. We will wait for final approval until then, but I don't have any concerns outside of the tests.

[alisonlhart]

Test fixtures need a LICENSE file for the new check.

[rivv0]

yes would do that.