[chore] OTL-3922 Enable all the linters and resolve the issues

[akhileshsingh85]

Description: Enable all the linter and resolve the issue

Testing: Golint test

Documentation:

[codecov]

Codecov Report

❌ Patch coverage is 47.05882% with 81 lines in your changes missing coverage. Please review.
✅ Project coverage is 33.63%. Comparing base (0ede663) to head (01d7d8f).

Files with missing lines	Patch %	Lines
tests/testutils/collector_container.go	21.05%	15 Missing ⚠️
tests/testutils/collector_process.go	27.27%	8 Missing ⚠️
tests/testutils/testcase.go	0.00%	7 Missing ⚠️
internal/settings/settings.go	54.54%	4 Missing and 1 partial ⚠️
tests/testutils/expvarz_to_map.go	0.00%	5 Missing ⚠️
internal/confmapprovider/discovery/config.go	0.00%	4 Missing ⚠️
internal/receiver/discoveryreceiver/receiver.go	50.00%	3 Missing and 1 partial ⚠️
tests/testutils/container.go	42.85%	4 Missing ⚠️
tests/testutils/endpoint.go	75.00%	4 Missing ⚠️
tests/testutils/socket_proxy.go	0.00%	4 Missing ⚠️
... and 13 more

❌ Your patch check has failed because the patch coverage (47.05%) is below the target coverage (85.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6974      +/-   ##
==========================================
- Coverage   38.01%   33.63%   -4.39%     
==========================================
  Files         367      366       -1     
  Lines       25713    20940    -4773     
==========================================
- Hits         9776     7044    -2732     
+ Misses      15124    13302    -1822     
+ Partials      813      594     -219     

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