[ZkTracer] feat: enable sampling for parameterized tests

[DavePearce]

This adds sampling using a seed based on the day of the month to all parameterized tests. Specifically, sampling employs a cap to ensure that at most N individual tests are run for each parameterized test. Here, N is set by default to 100, but can be overriden as needed. This also enables KOALABEAR_16 on the unit & replay tests (which is the primary motivation for using sampling).

This PR implements issue(s) #2576

---

Note

Medium Risk
Moderate risk because it changes test execution coverage and determinism across CI by sampling parameterized inputs; failures may be harder to detect or reproduce if sampling is misconfigured.

Overview
Enables commit-hash-seeded sampling across a large set of parameterized tests by routing their @MethodSource argument lists through Utilities.randomSampleByCurrentCommitHash(...), reducing the number of executed cases per run.

Adds a global sampling ratio PARAMETERIZED_TESTS_SAMPLE_SIZE (env-controlled, default 0.2, minimum 15 cases) and wires CI to set this value in the reusable unit test workflow. Removes several per-test hardcoded sample-size knobs and refactors some generators to return List<Arguments> so sampling can be applied consistently; also drops a few ad-hoc nightly/5% shuffle-based samplers in favor of the unified mechanism.

^{Written by Cursor Bugbot for commit 94f3f47. This will update automatically on new commits. Configure here.}

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 9.70%. Comparing base (bd97b6c) to head (08d8f5b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #2577       +/-   ##
============================================
- Coverage     59.07%   9.70%   -49.37%     
============================================
  Files           454     454               
  Lines         18530   18530               
  Branches       2014    2014               
============================================
- Hits          10947    1799     -9148     
- Misses         6915   16731     +9816     
+ Partials        668       0      -668     

Flag	Coverage Δ		*Carryforward flag
hardhat	96.53% <ø> (ø)		Carriedforward from a7b234e
kotlin	0.10% <ø> (-54.83%)	⬇️

*This pull request uses carry forward flags. Click here to find out more.
see 294 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

^{Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, have a team admin enable autofix in the Cursor dashboard.}