Add TrustBundleLabelKey to register

[ReToCode]

Changes

• Adding a new label key TrustBundleLabelKey to identify CA trust-bundles for Knative encryption (implement trusting a CA bundle serving#14609)

/assign @skonto

[knative-prow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (bb18aab) 82.18% compared to head (7cee540) 82.18%.
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #900   +/-   ##
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  Coverage   82.18%   82.18%           
=======================================
  Files          46       46           
  Lines        1746     1746           
=======================================
  Hits         1435     1435           
  Misses        268      268           
  Partials       43       43           

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[skonto]

/lgtm