fix(appcontroller): selfhealattemptscount needs to be reset at times

[blakepettersson]

SelfHealAttemptsCount should be reset when either a new revision is available or if the same revision has previously successfully synced. Fixes #21599.

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.
• I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
• Does this PR require documentation updates?
• I've updated documentation as required by this PR.
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• My new feature complies with the feature status guidelines.
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[codecov]

Codecov Report

Attention: Patch coverage is 79.16667% with 5 lines in your changes missing coverage. Please review.

Project coverage is 55.84%. Comparing base (a1431be) to head (494741c).
Report is 495 commits behind head on master.

Files with missing lines	Patch %	Lines
controller/appcontroller.go	79.16%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #22095      +/-   ##
==========================================
+ Coverage   55.75%   55.84%   +0.09%     
==========================================
  Files         341      342       +1     
  Lines       57004    57148     +144     
==========================================
+ Hits        31780    31917     +137     
- Misses      22590    22605      +15     
+ Partials     2634     2626       -8     

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[ishitasequeira]

LGTM!!