Enable Job Token to retrieve Tag via REST API

Timo Furrerrequested to merge
allow-job-token-get-tag into master

What does this MR do and why?

Enable Job Token to retrieve Tag via REST API

This change set adds support for the CI Job Token as a valid authentication token to retrieve project tags via the REST API. The listing endpoint for tags already supports it and so, I think the endpoint to retrieve a single tag should support it too.

This enables full support for the GitLab CLI to auto-login to create a release of which part is to check for the release tag. Without this feature we have to resort to page through the listing endpoint to find our tag which is not particularly good.

Changelog: changed

References

cli#8071 (comment 2951317176)

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