pkg/csplugin: use backoff package to retry notifications

[mmetc]

we may want to review/tune the timings

[github-actions]

@mmetc: There are no area labels on this PR. You can add as many areas as you see fit.

• /area agent
• /area local-api
• /area cscli
• /area appsec
• /area security
• /area configuration

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[codecov]

Codecov Report

❌ Patch coverage is 87.75510% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.76%. Comparing base (afe69fa) to head (343db65).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/csplugin/broker.go	66.66%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3944      +/-   ##
==========================================
+ Coverage   62.69%   62.76%   +0.07%     
==========================================
  Files         457      458       +1     
  Lines       33036    33073      +37     
==========================================
+ Hits        20712    20759      +47     
+ Misses      10203    10196       -7     
+ Partials     2121     2118       -3     

Flag	Coverage Δ
bats	46.36% <65.30%> (+<0.01%)	⬆️
unit-linux	35.44% <87.75%> (+0.09%)	⬆️
unit-windows	24.81% <87.75%> (+0.09%)	⬆️

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