SDKv2 Diff tests for secret primitive types

[VenelinMartinov]

This adds Diff tests for the SDKv2 bridge for secrets in primitive types.

Part of #2791

[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 67.49%. Comparing base (8bb538e) to head (ed5ef20).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2834   +/-   ##
=======================================
  Coverage   67.49%   67.49%           
=======================================
  Files         325      325           
  Lines       41621    41621           
=======================================
  Hits        28093    28093           
  Misses      11951    11951           
  Partials     1577     1577           

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