Refactor SDKv2 set detailed diff tests to correct files

[VenelinMartinov]

This PR deletes some of the tests which are now made redundant by equivalent cross-tests and moves the tests for unknowns sets to detailed_diff_unknown_test.go

[VenelinMartinov]

This change is part of the following stack:

• Add SDKv2 Detailed Diff tests for list replacements #2735
  • Add SDKv2 Detailed Diff tests for lists with many elements #2736
    • Add SDKv2 Detailed Diff tests for Computed properties in sets #2740
      • Refactor SDKv2 set detailed diff tests to correct files #2741 ◀

_{Change managed by git-spice.}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.64%. Comparing base (bd80587) to head (9aa9385).

Additional details and impacted files

@@                            Coverage Diff                            @@
##           vvm/sdkv2_detailed_diff_computed_in_sets    #2741   +/-   ##
=========================================================================
  Coverage                                     69.64%   69.64%           
=========================================================================
  Files                                           301      301           
  Lines                                         38726    38726           
=========================================================================
  Hits                                          26969    26969           
  Misses                                        10240    10240           
  Partials                                       1517     1517           

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