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 68.67%. Comparing base (27c2419) to head (89867cb).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2813   +/-   ##
=======================================
  Coverage   68.66%   68.67%           
=======================================
  Files         325      325           
  Lines       41579    41579           
=======================================
+ Hits        28551    28553    +2     
+ Misses      11423    11420    -3     
- Partials     1605     1606    +1     

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