ci: verify clean-branch unit test fixes

[warku123]

Validation-only draft PR (do not merge). Triggers 3-round retry=0 full-chain verification for the clean-branch test fixes (no 3for content). Base: release_v4.8.3.

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Summary by cubic

Validation-only draft PR (do not merge) that verifies the clean-branch test isolation fixes on release_v4.8.3 by running three rounds of the suite with Gradle test retries disabled. Retries could previously rerun failed tests and hide static state pollution; this run forces maxRetries=0 and fails on any nonzero Gradle exit, on Linux JDK 8 and macOS JDK 17.

Test Isolation

• PeerManagerStateResetter drains the executor, disconnects residual peers, zeroes counters, and runs in BaseTest/BaseMethodTest and five p2p/handler test classes.
• VMConfigRule snapshots and restores VM flags via rules on BaseTest and BaseMethodTest.
• SendCoinShieldTest and ShieldedReceiveTest restore allowShieldedTransaction per test; ShieldedReceiveTest initializes the witness schedule once without racing the background producer, and TransactionsMsgHandlerTest waits on a latch, shuts down swapped-out pools, and uses mock pools that never execute the async worker so Mockito stubbing races are avoided.
• AllowTvmLondonTest fixes the base-fee assertion order, backup tests replace sleeps with condition waits and tear down channels/executors, and fixed ports (5555, Prometheus) are randomized.
• Native message queues are released via stopPlugin() in finally/teardown paths so sockets are freed even on assertion failures.

CI Verification

• Workflow runs clean build, testWithRocksDb, and jacocoTestReport in three rounds with retries forced to 0 via retry_zero.init.gradle, on both Linux JDK 8 and macOS JDK 17.
• jacoco_baseline_summary.py emits per-round JaCoCo/JUnit summaries and evidence manifests.

^{Written for commit f37a38b. Summary will update on new commits.}

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[warku123]

Closing: superseded by PR #19 (fix/unit-test-cleanup-release, release_v4.8.3 base). This verification branch served its retry=0 evidence purpose; branch will be removed.