Add GitLab-Pages version to Admin Dashboard

What does this MR do?

Displays the GitLab-Pages version in the admin dashboard.

Are there points in the code the reviewer needs to double check?

  • Is pulling the version number from the GITLAB_PAGES_VERSION file the correct place?
  • Should the GitLab-Pages version not be listed if GitLab-Pages is disabled?

Why was this MR needed?

Requested in #36953 (closed)

Screenshots (if relevant)


Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Closes #36953 (closed)

Edited by username-removed-128633

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