Generate SDKs via pulumi package gen-sdk

[VenelinMartinov]

This PR removes the direct function calls into programgen for SDK generation in the bridge. Instead we now rely on the pulumi cli for this via pkg gen-sdk. This should produce no changes in the generated SDKs.

I've verified that AWS builds fine and has no SDK changes under this change. CI run here: pulumi/pulumi-aws#5512

fixes #1488

[codecov]

Codecov Report

Attention: Patch coverage is 51.13636% with 43 lines in your changes missing coverage. Please review.

Project coverage is 68.80%. Comparing base (640b799) to head (95a6b47).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/tfgen/generate.go	51.13%	29 Missing and 14 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3053      +/-   ##
==========================================
+ Coverage   68.62%   68.80%   +0.18%     
==========================================
  Files         335      335              
  Lines       43479    43561      +82     
==========================================
+ Hits        29837    29972     +135     
+ Misses      11959    11877      -82     
- Partials     1683     1712      +29     

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[VenelinMartinov]

This change is part of the following stack:

• bump pu/pu to 3.169.0 #3063
  • Generate SDKs via pulumi package gen-sdk #3053 ◀

_{Change managed by git-spice.}

[VenelinMartinov]

Found an issue with Csharp gen-sdk during testing: pulumi/pulumi#19554

[pulumi-bot]

This PR has been shipped in release v3.109.0.