Refactor Condition.Stats and DirectoryFileTransferTracker.Stats with Builder pattern

[pado0]

Description

This PR refactors the Condition.Stats and DirectoryFileTransferTracker.Stats class to use the Builder pattern instead of relying on multiple constructors.

By adopting the Builder pattern, it becomes easier to evolve the stats API, add new metrics, and maintain backward compatibility without forcing disruptive constructor changes.

Based on the related issue:

1. Added a Builder and deprecated the existing constructors.
2. Replaced usages of constructors in code and tests with the new Builder.

There are multiple stats-related classes that need similar refactoring, and we are addressing them in priority order. This PR covers Condition.Stats and DirectoryFileTransferTracker.Stats as part of that effort.

Related Issues

Related to #19225

Check List

• Functionality includes testing.

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❌ Gradle check result for d34b9e7: FAILURE

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❌ Gradle check result for bdcb3cd: FAILURE

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❌ Gradle check result for 0158f39: FAILURE

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✅ Gradle check result for 0158f39: SUCCESS

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.22%. Comparing base (f3e6399) to head (78938ec).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main   #19862   +/-   ##
=========================================
  Coverage     73.21%   73.22%           
+ Complexity    71564    71542   -22     
=========================================
  Files          5785     5785           
  Lines        326759   326814   +55     
  Branches      47291    47291           
=========================================
+ Hits         239246   239304   +58     
+ Misses        68272    68252   -20     
- Partials      19241    19258   +17     

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[github-actions]

✅ Gradle check result for 8968d2d: SUCCESS

[github-actions]

❕ Gradle check result for 82a6b4b: UNSTABLE

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[github-actions]

✅ Gradle check result for f427ebb: SUCCESS

[pado0]

I'll work on the next Stats class once comments are resolved and this PR is merged!

[github-actions]

❌ Gradle check result for 78938ec: 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 78938ec: 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 78938ec: SUCCESS