tests(instance): use sdk vcr (go-vcr.v4) for instance package

[Mia-Cross]

This PR starts the migration of tests cassettes from go-vcr (v1.20) to go-vcr.v4 with the instance package. This will be done by gradually making packages use the vcr client from the sdk-go.

The biggest benefit of this change will be to be able to use the SkipRequestLatency option on the recorder that was introduced in v3. This will allow us to replay cassettes a lot faster because interactions will not simulate the requests' duration anymore, therefore making the CI faster.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 42.30769% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.47%. Comparing base (5060bb1) to head (08f6f61).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
core/testing_recorder.go	0.00%	8 Missing ⚠️
core/testing.go	61.11%	3 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5089      +/-   ##
==========================================
+ Coverage   57.43%   57.47%   +0.03%     
==========================================
  Files         308      308              
  Lines       67126    67151      +25     
==========================================
+ Hits        38552    38593      +41     
+ Misses      27140    27121      -19     
- Partials     1434     1437       +3     

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