Move PF detailed diff test to separate folder

[VenelinMartinov]

This PR moves the PF detailed diff tests to a separate folder. This should make it easier to reuse some code between them without exposing it to the other tests in the folder. No other changes in this PR.

[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

_{Change managed by git-spice.}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.64%. Comparing base (814b7b9) to head (0e4fc2e).

Additional details and impacted files

@@                             Coverage Diff                             @@
##           vvm/remove_redundant_bridged_provider_util    #2813   +/-   ##
===========================================================================
  Coverage                                       68.64%   68.64%           
===========================================================================
  Files                                             325      325           
  Lines                                           41550    41550           
===========================================================================
  Hits                                            28521    28521           
  Misses                                          11423    11423           
  Partials                                         1606     1606           

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