[DO NOT MERGE] Enable PlanResourceChange by default

[VenelinMartinov]

Related to #1962

Adds a env var to enable PlanResourceChange for all resources.

[VenelinMartinov]

Actually, I don't really want to merge this - I'll just default enable and run downstream tests off the branch.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 60.55%. Comparing base (d57cd0e) to head (bbf9da5).

❗ Current head bbf9da5 differs from pull request most recent head 3242c86. Consider uploading reports for the commit 3242c86 to get more accurate results

Files	Patch %	Lines
pkg/tfshim/sdk-v2/provider.go	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1963      +/-   ##
==========================================
- Coverage   60.56%   60.55%   -0.02%     
==========================================
  Files         331      331              
  Lines       44726    44728       +2     
==========================================
- Hits        27090    27084       -6     
- Misses      16113    16121       +8     
  Partials     1523     1523              

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[VenelinMartinov]

Quit a few failures:

FAILURE pulumi/pulumi-cloudflare#774
FAILURE pulumi/pulumi-auth0#540
FAILURE pulumi/pulumi-hcloud#506
FAILURE pulumi/pulumi-aws#3931
FAILURE pulumi/pulumi-azuread#1050
FAILURE pulumi/pulumi-azure#2030
FAILURE pulumi/pulumi-gitlab#598
FAILURE pulumi/pulumi-docker#1095
FAILURE pulumi/pulumi-cloudamqp#439
FAILURE pulumi/pulumi-fastly#536 (panic
MISSING https://github.com/pulumi/pulumi-meraki/actions/workflows/upgrade-bridge.yml (unrelated)
MISSING https://github.com/pulumi/pulumi-gcp/actions/workflows/upgrade-bridge.yml (failed to discover resource during tfgen)
MISSING https://github.com/pulumi/pulumi-okta/actions/workflows/upgrade-bridge.yml (failed to discover resource during tfgen)

[VenelinMartinov]

Actually, not enough failures probably, I'll prioritise #1849 first