[v3] Make PULUMI_FORCE_NEW_FROM_SUBTYPES the default

[EronWright]

Enables the functionality of PULUMI_FORCE_NEW_FROM_SUBTYPES by default in v3. In v2, behavior is unchanged. In any version, setting PULUMI_FORCE_NEW_FROM_SUBTYPES overrides the default behavior.

Closes #3006

[github-actions]

Does the PR have any schema changes?

Looking good! No breaking changes found.
No new resources/functions.

[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 3 lines in your changes missing coverage. Please review.

Project coverage is 56.65%. Comparing base (b2e76de) to head (c392fbb).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
provider/pkg/provider/diff.go	57.14%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3771      +/-   ##
==========================================
+ Coverage   56.63%   56.65%   +0.02%     
==========================================
  Files          78       78              
  Lines       11969    11975       +6     
==========================================
+ Hits         6779     6785       +6     
+ Misses       4690     4689       -1     
- Partials      500      501       +1     

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