refactor: update check-licenses to exclude non-runtime dependencies during checks

[moe-ad]

Closes #1066.

Note

Whoever reviews this PR should also check #1563.

Poetry-related changes

So, when the issue was originally opened, pymaterials-manager was still using poetry, however, the project has since migrated to uv, which really complicated my life as there was no way to easily reproduce anymore... :)

Nonetheless, I looked into it and the main issue stems from the fact that poetry automatically installs all non-optional groups (check this section to find out more about "optional groups" in poetry lingo) when executing poetry install (see this section). To install only runtime dependencies, we need to pass --only main as I have done.

UV-related changes

uv also behaves similarly, in that it automatically syncs with the dev group included. Fine, we already pass --no-dev but I have updated that to --no-default-groups to make things more robust. This is because uv actually reads the default-groups setting to determine what groups to automatically include during a sync (and dev just happens to be the default value). So if a project reconfigures this setting to include other groups, --no-dev will no longer be sufficient.

Others

Given that an external virtual environment can be passed to the check-licenses action via the activate-venv input (which we have no control over), I have added a warning log to inform users about their role in ensuring the provided virtual environment contains only the packages whose licenses need to be checked.

[SMoraisAnsys]

Thanks for the changes @moe-ad ! LGTM, please let others also review the PR and do not merge it too fast (see this comment)

[jorgepiloto]

Thanks for adding this, @moe-ad