notification plugins: readability / dry refact, unnecessary pointers

[mmetc]

No description provided.

[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

Details

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 62 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.96%. Comparing base (b1f8e05) to head (9ce39a2).
⚠️ Report is 22 commits behind head on master.

Files with missing lines	Patch %	Lines
cmd/notification-sentinel/main.go	0.00%	16 Missing ⚠️
cmd/notification-dummy/main.go	0.00%	13 Missing ⚠️
cmd/notification-http/main.go	0.00%	10 Missing ⚠️
cmd/notification-slack/main.go	0.00%	10 Missing ⚠️
cmd/notification-splunk/main.go	0.00%	7 Missing ⚠️
cmd/notification-email/main.go	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4166      +/-   ##
==========================================
+ Coverage   62.94%   62.96%   +0.02%     
==========================================
  Files         467      467              
  Lines       33288    33299      +11     
==========================================
+ Hits        20954    20968      +14     
- Misses      10218    10220       +2     
+ Partials     2116     2111       -5     

Flag	Coverage Δ
bats	46.13% <0.00%> (-0.02%)	⬇️
unit-linux	35.77% <0.00%> (+<0.01%)	⬆️
unit-windows	25.07% <0.00%> (+<0.01%)	⬆️

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