feat(web-api): Add support for admin.users.getExpiration

[misscoded]

⚠️ Note: Java hasn't been updated, so generated response is not being returned. Needs to be in place and re-ran for this PR to be complete/merged.

Summary

Adds support for admin.users.getExpiration (and updates generated responses). See documentation.

Resolves #2420.

Requirements (place an x in each [ ])

• [x] I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• [x] I've read and agree to the Code of Conduct.

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 93.09%. Comparing base (bb284c6) to head (d4211e8). :white_check_mark: All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2451   +/-   ##
=======================================
  Coverage   93.09%   93.09%           
=======================================
  Files          40       40           
  Lines       11240    11240           
  Branches      713      713           
=======================================
  Hits        10464    10464           
  Misses        764      764           
  Partials       12       12           

Flag	Coverage Δ
cli-hooks	95.23% <ø> (ø)
cli-test	94.79% <ø> (ø)
webhook	96.66% <ø> (ø)

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