Remove tests for legacy keystore format

[andrross]

These tests have been disabled for over 4 years.

Check List

• Functionality includes testing.

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[github-actions]

❌ Gradle check result for dd30900: FAILURE

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[github-actions]

❌ Gradle check result for 70be938: FAILURE

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[github-actions]

❌ Gradle check result for 70be938: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

❌ Gradle check result for 70be938: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

❌ Gradle check result for 70be938: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

✅ Gradle check result for 70be938: SUCCESS

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.53%. Comparing base (a6724d3) to head (70be938).
Report is 80 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main   #18154   +/-   ##
=========================================
  Coverage     72.53%   72.53%           
+ Complexity    67207    67148   -59     
=========================================
  Files          5476     5476           
  Lines        310436   310437    +1     
  Branches      45121    45121           
=========================================
+ Hits         225179   225182    +3     
+ Misses        66894    66832   -62     
- Partials      18363    18423   +60     

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