Refactor: Reduce pfutils in runtime usage

[iwahbe]

Built on top of #2075

This PR removes pfutil from github.com/pulumi/pulumi-terraform-bridge/pf.ShimProvider (introduced in #2075). There should be no runtime effects.

[codecov]

Codecov Report

Attention: Patch coverage is 45.45455% with 30 lines in your changes missing coverage. Please review.

Project coverage is 61.20%. Comparing base (9cddce4) to head (ea3c33f).

Files	Patch %	Lines
pf/internal/pfutils/datasources.go	33.33%	4 Missing ⚠️
pf/internal/schemashim/provider.go	20.00%	4 Missing ⚠️
pf/tfbridge/provider_resources.go	0.00%	3 Missing ⚠️
pf/internal/pfutils/common.go	60.00%	2 Missing ⚠️
pf/internal/schemashim/datasource_map.go	0.00%	2 Missing ⚠️
pf/tfbridge/provider_datasources.go	0.00%	2 Missing ⚠️
pf/tfbridge/provider_invoke.go	0.00%	2 Missing ⚠️
pf/tfbridge/resource_state.go	0.00%	2 Missing ⚠️
pf/internal/pfutils/resources.go	87.50%	1 Missing ⚠️
pf/internal/schemashim/datasource.go	0.00%	1 Missing ⚠️
... and 7 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2076      +/-   ##
==========================================
- Coverage   62.01%   61.20%   -0.81%     
==========================================
  Files         338      339       +1     
  Lines       37524    45132    +7608     
==========================================
+ Hits        23270    27625    +4355     
- Misses      12739    15987    +3248     
- Partials     1515     1520       +5     

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[VenelinMartinov]

Looks good