[otelcol] Preserve internal representation for components' configurations

[mx-psi]

Description

The custom unmarshalling for components copied a map without preserving the internal representation. This led to the issues mentioned on #10552 not being fully fixed (they were only fixed if they happened in the service::telemetry section for example).

Link to tracking issue

Fixes issues mentioned on #10552

Testing

This adds one unit test at the otelcol level. Since we didn't catch this with our current confmap/internal/e2e tests, we likely also want to refactor those.

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 91.59%. Comparing base (dec435a) to head (92951ab).
Report is 2 commits behind head on main.

Files	Patch %	Lines
otelcol/internal/configunmarshaler/configs.go	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10897      +/-   ##
==========================================
- Coverage   91.60%   91.59%   -0.01%     
==========================================
  Files         404      404              
  Lines       18980    18983       +3     
==========================================
+ Hits        17387    17388       +1     
- Misses       1234     1235       +1     
- Partials      359      360       +1     

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[crobert-1]

Generated code is out of date, please run "make gogenerate" and commit the changes in this PR.

Just comments from failing check and lint.