Add a fallback for detailed diff replace decisions to ensure detailed diff is presentation-only

[VenelinMartinov]

This change adds a fallback for the detailed diff replace decision. This ensures that the detailed diff is presentation only.

If we fail to identify the reason for a replace in the detailed diff calculation we mark it against __meta, similar to what we did before:

pulumi-terraform-bridge/pkg/tfbridge/provider.go

Line 1262 in a952164

replaces = append(replaces, "__meta")

If we incorrectly identify a non-existent replace we demote it to an update/create/delete.

This is flagged behind the Accurate Previews flag.

fixes #2674
fixes #2726

[VenelinMartinov]

This change is part of the following stack:

• Add a fallback for detailed diff replace decisions to ensure detailed diff is presentation-only #2747 ◀
  • SDKv2 Only return a detailed diff if a diff is detected #2750
  • Re-enable detailed diff replace tests for SDKv2 lists and sets #2751
    • Add SDKv2 Detailed Diff tests for Computed properties in sets #2740
      • Refactor SDKv2 set detailed diff tests to correct files #2741

_{Change managed by git-spice.}

[codecov]

Codecov Report

Attention: Patch coverage is 83.72093% with 7 lines in your changes missing coverage. Please review.

Project coverage is 68.84%. Comparing base (505e6eb) to head (f3e38a9).

Files with missing lines	Patch %	Lines
pkg/pf/tfbridge/provider_diff.go	0.00%	4 Missing ⚠️
pkg/tfbridge/detailed_diff.go	91.89%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@                           Coverage Diff                           @@
##           vvm/pf_tests_disable_accurate_previews    #2747   +/-   ##
=======================================================================
  Coverage                                   68.83%   68.84%           
=======================================================================
  Files                                         302      302           
  Lines                                       38736    38775   +39     
=======================================================================
+ Hits                                        26663    26693   +30     
- Misses                                      10562    10569    +7     
- Partials                                     1511     1513    +2     

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[iwahbe]

I have a couple optional style nits, but it looks good.

[t0yv0]

Seems very important. Can you add a quick note on flagging, does it roll out right away or it's flagged with accurate previews? Thanks.