pkg/csplugin: use backoff package to send 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 90.00000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.54%. Comparing base (259d0f2) to head (006df24).
⚠️ Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/csplugin/broker.go	71.42%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3944      +/-   ##
==========================================
- Coverage   61.59%   61.54%   -0.05%     
==========================================
  Files         409      410       +1     
  Lines       42062    42109      +47     
==========================================
+ Hits        25906    25917      +11     
- Misses      14034    14065      +31     
- Partials     2122     2127       +5     

Flag	Coverage Δ
bats	45.67% <68.33%> (+0.07%)	⬆️
unit-linux	34.56% <90.00%> (+0.01%)	⬆️
unit-windows	24.55% <90.00%> (+0.03%)	⬆️

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