Backport add Rake task to show token expiration info

This is a backport for release 16-9-stable-ee for this script be provided in earlier release. Admin can update a PAT expiry date using this script

Related MR - !157855 (merged)

Related Issue - gitlab-org/release/tasks#11508 (closed)

What does this MR do and why?

Describe in detail what merge request is being backported and why

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• This MR is backporting a bug fix, documentation update, or spec fix, previously merged in the default branch.
• The MR that fixed the bug on the default branch has been deployed to GitLab.com (not applicable for documentation or spec changes).
• This MR has a severity label assigned (if applicable).
• Set the milestone of the merge request to match the target backport branch version.
• This MR has been approved by a maintainer (only one approval is required).
• Ensure the e2e:package-and-test-ee job has either succeeded or been approved by a Software Engineer in Test.

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