refactor unknown collection supported flag

[VenelinMartinov]

No description provided.

[VenelinMartinov]

This change is part of the following stack:

• Assert empty stderr in Diff cross-tests #2890
  • Fix Accurate Previews for set-nested sets #2891
    • refactor unknown collection supported flag #2895 ◀

_{Change managed by git-spice.}

[codecov]

Codecov Report

Attention: Patch coverage is 79.31034% with 6 lines in your changes missing coverage. Please review.

Project coverage is 29.44%. Comparing base (bc0731c) to head (1a6c9b1).

Files with missing lines	Patch %	Lines
pkg/tfbridge/provider.go	66.66%	3 Missing ⚠️
pkg/tfbridge/schema.go	89.47%	2 Missing ⚠️
pkg/tfshim/sdk-v2/schema.go	0.00%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (bc0731c) and HEAD (1a6c9b1). Click for more details.

HEAD has 10 uploads less than BASE

Flag	BASE (bc0731c)	HEAD (1a6c9b1)
	14	4

Additional details and impacted files

@@                         Coverage Diff                          @@
##           vvm/nested_set_diff_cross_tests    #2895       +/-   ##
====================================================================
- Coverage                            43.03%   29.44%   -13.60%     
====================================================================
  Files                                  309      308        -1     
  Lines                                40929    40880       -49     
====================================================================
- Hits                                 17615    12038     -5577     
- Misses                               21745    27572     +5827     
+ Partials                              1569     1270      -299     

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