fix: update cached informer object instead of reloading app to avoid duplicated notifications

[alexmt]

Signed-off-by: Alexander Matyushentsev AMatyushentsev@gmail.com

Argo CD notifications might send the same notification twice or don't send notification due to stale data in the application informer. First attempt to fix it was to reload updated app before sending notification but this approach is not effective.

This PR implements an alternative approach: after patching application annotations controller immidatelly updates informer cache using application returned by patch request.

[codecov]

Codecov Report

Merging #204 (45000d1) into master (1c2dafe) will decrease coverage by 1.32%.
The diff coverage is 57.81%.

@@            Coverage Diff             @@
##           master     #204      +/-   ##
==========================================
- Coverage   51.53%   50.21%   -1.33%     
==========================================
  Files          34       33       -1     
  Lines        1690     1665      -25     
==========================================
- Hits          871      836      -35     
- Misses        647      661      +14     
+ Partials      172      168       -4     

Impacted Files	Coverage Δ
pkg/controller/subscriptions.go	74.13% <ø> (ø)
pkg/controller/state.go	48.83% <48.83%> (ø)
controller/controller.go	72.47% <72.22%> (-0.94%)	⬇️
bot/server.go	57.95% <100.00%> (ø)

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