gin middleware: drop closures

[mmetc]

no need to use MiddlewareFunc if everything needs to be run for each request

[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 71.23288% with 21 lines in your changes missing coverage. Please review.
✅ Project coverage is 35.69%. Comparing base (91ffe2e) to head (ebf4cd0).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/apiserver/middlewares/v1/api_key.go	50.00%	12 Missing and 5 partials ⚠️
pkg/apiserver/controllers/v1/metrics.go	87.09%	2 Missing and 2 partials ⚠️

❗ There is a different number of reports uploaded between BASE (91ffe2e) and HEAD (ebf4cd0). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (91ffe2e)	HEAD (ebf4cd0)
bats	1	0

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #4186       +/-   ##
===========================================
- Coverage   62.90%   35.69%   -27.22%     
===========================================
  Files         467      466        -1     
  Lines       33274    33267        -7     
===========================================
- Hits        20932    11873     -9059     
- Misses      10216    20019     +9803     
+ Partials     2126     1375      -751     

Flag	Coverage Δ
bats	?
unit-linux	35.67% <71.23%> (+0.03%)	⬆️
unit-windows	25.01% <5.47%> (+<0.01%)	⬆️

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[sabban]

lgtm