build: register all CI hapi test task as real Test task

[jjohannes]

Description:

Do no longer have logic based on gradle.startParameter.taskNames. Instead, all tasks are registered as Test tasks with the corresponding custom configuration. This has the advantage that (failing) tests are associated with the task that runs them. In general, it makes the setup more straight-forward and idiomatic.

The following beahviour changes compared to main, which does not change how tasks are called from CI:

• If a task like hapiTestCrypto is called it runs the tests directly instead of doing an ad-hoc reconfiguration of testSubprocess and running that.
• If two tasks are called together in one Gradle execution – e.g. ./gradlew hapiTestAdhoc hapiTestCrypto both tasks run and execute their tests. Instead of one testSubprocess task that combines the two. ⚠️ In practice we do not use this in the CI pipeline, as the point is to split up things into separate Gradle calls that run independently. Thus I think it is okay to remove this "feature" as it is not (and probably never was) actively used ⚠️.

Related issue(s):

Follow up to #26945

Notes for reviewer:

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[lfdt-bot]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues

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[testlens-app]

✅ All tests passed ✅

⚠️ TestLens detected flakiness ⚠️

Test Summary

600: [FLOW] PR Checks / MATS / HAPI Tests / hapi-tests-misc / HAPI Tests (Misc) > :test-clients:hapiTestMisc

Test	Runs	Flakiness
HollowAccountsAndKeysBatchTest > BatchKey rotation inside batch: one inner tx with old batch key, should pass > as written	❌ ✅	0% 🟢

600: [FLOW] PR Checks / MATS / HAPI Tests / hapi-tests-misc-records-crypto-and-serial / HAPI Tests (Misc Records, Crypto & Misc Serial) > :test-clients:hapiTestCrypto

Test	Runs	Flakiness
ConcurrentSubprocessValidationTest > validateLogsAndStreams() > as written	❌ ✅	0% 🟢

🏷️ Commit: 73db260
▶️ Tests: 922 executed
⚪️ Checks: 43/43 completed

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@             Coverage Diff              @@
##               main   #27011      +/-   ##
============================================
- Coverage     70.54%   70.54%   -0.01%     
  Complexity    11691    11691              
============================================
  Files          2586     2586              
  Lines        108553   108553              
  Branches      12166    12166              
============================================
- Hits          76584    76581       -3     
- Misses        27971    27973       +2     
- Partials       3998     3999       +1     

see 1 file with indirect coverage changes

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