Apeksha.contractor/500220 container registry image details

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What does this MR do and why?

Add GraphQL query for container registry tag details

Implements a new GraphQL query to fetch detailed information about specific container registry tags, enhancing the API capabilities for container management.

References

• docs(gitlab/v1): single repository tag details

MR acceptance checklist

• The code follows GitLab's GraphQL API styleguide
• Appropriate error handling is implemented
• Security implications are considered (e.g., proper authorization checks)

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

N/A

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

Related to #500220