Upgrade Pulumi to v3.120.0 (simply)

[iwahbe]

Given the difficulties associated with #2109 and #2099, I thought we should try doing the minimal work necessary to upgrade. We can then iterate from here without falling further behind on pulumi/pulumi.

Update 1: I believe that TestCollectionsNullEmptyRefreshClean continues to fail. This is unfortunate but not shocking given that it is an integration test on refresh, and we changed the behavior of refresh in pulumi/pulumi v3.120.0. It looks like that is the only test failing. make -C pf test runs cleanly.

Update 2: The test resolves when you upgrade the local CLI for pulumi to v3.120.0.

[codecov]

Codecov Report

Attention: Patch coverage is 8.82353% with 93 lines in your changes missing coverage. Please review.

Project coverage is 60.68%. Comparing base (4cecc87) to head (ad64817).

Files	Patch %	Lines
pf/internal/plugin/provider_context.go	0.00%	61 Missing ⚠️
pkg/tfgen/pluginHost.go	19.04%	17 Missing ⚠️
pkg/tfbridge/provider.go	27.77%	13 Missing ⚠️
pf/tfbridge/provider.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2112      +/-   ##
==========================================
- Coverage   60.74%   60.68%   -0.06%     
==========================================
  Files         350      350              
  Lines       45704    45741      +37     
==========================================
- Hits        27761    27759       -2     
- Misses      16425    16463      +38     
- Partials     1518     1519       +1     

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