feat: Add app metric for skip-reconcile feature

[baurmatt]

This people to build alerts for apps being to long in skip-reconcile state.

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
• The title of the PR conforms to the Toolchain Guide
• I've included "Closes [ISSUE #]" or "Fixes [ISSUE #]" in the description to automatically close the associated issue.
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• [-] Does this PR require documentation updates?
• I've updated documentation as required by this PR.
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[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 55.39%. Comparing base (5ef4faa) to head (81a85b9).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
controller/metrics/metrics.go	33.33%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #21626   +/-   ##
=======================================
  Coverage   55.39%   55.39%           
=======================================
  Files         339      339           
  Lines       57176    57181    +5     
=======================================
+ Hits        31672    31678    +6     
+ Misses      22797    22794    -3     
- Partials     2707     2709    +2     

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