SDKv2 Diff tests for Defaults in sets and lists

[VenelinMartinov]

This PR adds Diff tests for Defaults in Set and List schemas. Note that the List and Set themselves can not have Defaults, since TF throws an error on these: Default is not valid for lists or sets.

Related to #2788
Related to #2789

[VenelinMartinov]

This change is part of the following stack:

• SDKv2 Diff tests for secret primitive types #2834
  • SDKv2 Diff tests for secret list type #2835
    • SDKv2 Diff tests for secret set type #2836
      • Refactor Set and List Diff tests to use generic utilities #2837
        • SDKv2 Diff tests for Defaults in sets and lists #2838 ◀
          • SDKv2 Diff tests for MaxItemsOne sets #2839

_{Change managed by git-spice.}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.48%. Comparing base (413419b) to head (1dcbb01).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2838      +/-   ##
==========================================
- Coverage   67.48%   67.48%   -0.01%     
==========================================
  Files         325      325              
  Lines       41633    41633              
==========================================
- Hits        28097    28094       -3     
- Misses      11957    11959       +2     
- Partials     1579     1580       +1     

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