Add gosimple linter

[getvictor]

#23249

Add gosimple linter to golangci-lint CI job.

[codecov]

Codecov Report

Attention: Patch coverage is 68.25397% with 20 lines in your changes missing coverage. Please review.

Project coverage is 63.35%. Comparing base (b67127c) to head (58e1032).

Files with missing lines	Patch %	Lines
ee/server/service/software_installers.go	0.00%	3 Missing ⚠️
orbit/cmd/orbit/orbit.go	0.00%	3 Missing ⚠️
cmd/cpe/generate.go	33.33%	2 Missing ⚠️
orbit/pkg/table/dataflattentable/exec.go	0.00%	2 Missing ⚠️
server/config/config.go	0.00%	0 Missing and 2 partials ⚠️
server/fleet/hosts.go	0.00%	2 Missing ⚠️
cmd/fleet/serve.go	0.00%	1 Missing ⚠️
cmd/fleet/vuln_process.go	0.00%	1 Missing ⚠️
orbit/pkg/dataflatten/flatten.go	0.00%	0 Missing and 1 partial ⚠️
orbit/pkg/execuser/execuser_linux.go	0.00%	1 Missing ⚠️
... and 2 more

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #23250   +/-   ##
=======================================
  Coverage   63.35%   63.35%           
=======================================
  Files        1538     1538           
  Lines      144703   144675   -28     
  Branches     3654     3654           
=======================================
- Hits        91683    91666   -17     
+ Misses      45786    45780    -6     
+ Partials     7234     7229    -5     

Flag	Coverage Δ
backend	64.25% <68.25%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.