chore: add support for usetesting, nlreturn and exptostd

[remyleone]

Community Note

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Relates OR Closes #0000

Release note for CHANGELOG:

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 55.28169% with 127 lines in your changes missing coverage. Please review.

Project coverage is 69.22%. Comparing base (5bf53e0) to head (83a6b94).
Report is 486 commits behind head on master.

Files with missing lines	Patch %	Lines
core/testing.go	27.27%	8 Missing ⚠️
internal/args/unmarshal.go	60.00%	6 Missing ⚠️
internal/docgen/docgen.go	0.00%	6 Missing ⚠️
internal/namespaces/autocomplete/autocomplete.go	37.50%	5 Missing ⚠️
core/arg_specs.go	0.00%	4 Missing ⚠️
core/context.go	33.33%	4 Missing ⚠️
internal/args/args.go	0.00%	4 Missing ⚠️
internal/namespaces/baremetal/v1/custom_server.go	0.00%	4 Missing ⚠️
core/example.go	0.00%	3 Missing ⚠️
core/printer.go	0.00%	3 Missing ⚠️
... and 55 more

❗ There is a different number of reports uploaded between BASE (5bf53e0) and HEAD (83a6b94). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (5bf53e0)	HEAD (83a6b94)
	2	1

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4499      +/-   ##
==========================================
- Coverage   75.45%   69.22%   -6.23%     
==========================================
  Files         202      300      +98     
  Lines       44323    68157   +23834     
==========================================
+ Hits        33444    47185   +13741     
- Misses       9653    19318    +9665     
- Partials     1226     1654     +428     

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