Add operator build info metric

[SuperQ]

Add a new metric to the tidb-operator that exposes the build info as labels. This allows for monitoring of what versions are deployed across multiple installs.

[ti-chi-bot]

Hi @SuperQ. Thanks for your PR.

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[liubog2008]

thanks for your contribution

[liubog2008]

/ok-to-test

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.34%. Comparing base (44edb93) to head (013f3fa).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6680   +/-   ##
=======================================
  Coverage   38.34%   38.34%           
=======================================
  Files         373      373           
  Lines       21630    21630           
=======================================
  Hits         8294     8294           
  Misses      13336    13336           

Flag	Coverage Δ
unittest	38.34% <ø> (ø)

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[liubog2008]

/lgtm

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-01-28 15:32:55.583727926 +0000 UTC m=+1199203.197684772: ☑️ agreed by liubog2008.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: liubog2008

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