Add pb.Provider.ToProviderInfo test helper method

[VenelinMartinov]

This PR adds a ToProviderInfo test helper method to the providerbuilder test class. providerbuilder is the blessed way to build PF providers and we have various repeated code for turning this into a bridged provider ProviderInfo. The new method aims to consolidate them. This should also help with discoverability.

[VenelinMartinov]

This change is part of the following stack:

• move providerbuilder to pkg/pf/internal #2804
  • Add pb.Provider.ToProviderInfo test helper method #2805 ◀
    • Remove bridgedProvider test utilities in favour of ToProviderInfo #2812
      • Move PF detailed diff test to separate folder #2813
        • Refactor PF detailed diff tests #2814
          • Refactor sdkv2 detailed diff tests #2816
            • Test sharding #2810
    • repro for 2803 #2806

_{Change managed by git-spice.}

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 14 lines in your changes missing coverage. Please review.

Project coverage is 68.59%. Comparing base (2150faf) to head (380c0e9).

Files with missing lines	Patch %	Lines
pkg/pf/internal/providerbuilder/build_provider.go	0.00%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2805      +/-   ##
==========================================
- Coverage   68.63%   68.59%   -0.04%     
==========================================
  Files         325      325              
  Lines       41536    41550      +14     
==========================================
- Hits        28507    28502       -5     
- Misses      11423    11442      +19     
  Partials     1606     1606              

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[iwahbe]

This is good. I think it would be easier to review if it was combined with #2812, since we could see both the new method and it's usage.