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:

• Refactor SDKv2 set detailed diff tests to correct files #2741 ◀
  • Add a TransformPropertyValueDirectional property value walker #2760
    • Use non-computed property value comparison for matching detailed diff set inputs to plan #2761

_{Change managed by git-spice.}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.61%. Comparing base (0afd418) to head (b4c0769).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2741   +/-   ##
=======================================
  Coverage   68.60%   68.61%           
=======================================
  Files         322      322           
  Lines       41223    41223           
=======================================
+ Hits        28281    28284    +3     
+ Misses      11347    11345    -2     
+ Partials     1595     1594    -1     

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[t0yv0]

Waiting on antecedent PR being marked ready then can review!

[pulumi-bot]

This PR has been shipped in release v3.99.0.