feat: Container json testing

[another-rex]

Fork of #1602

Adds a JSON matching method, and implements a path enumeration function to help mock values in the snapshot to avoid polluting the logs with very long JSON values that we are not necessarily testing.

Moved the normalisation step into the match snapshot function itself to ensure that it is always the last step taken.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 91.80328% with 15 lines in your changes missing coverage. Please review.

Project coverage is 69.03%. Comparing base (3d964a5) to head (e7f9025).

Files with missing lines	Patch %	Lines
internal/testutility/jsonreplace.go	91.89%	4 Missing and 2 partials ⚠️
internal/testutility/utility.go	93.61%	4 Missing and 2 partials ⚠️
internal/testutility/snapshot.go	80.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1604      +/-   ##
==========================================
+ Coverage   68.80%   69.03%   +0.23%     
==========================================
  Files         200      201       +1     
  Lines       18990    19171     +181     
==========================================
+ Hits        13066    13235     +169     
- Misses       5229     5238       +9     
- Partials      695      698       +3     

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[another-rex]

@michaelkedar fyi this changes some of GR's snapshots to be technically incorrect (changes backslashes to forward slashes).