Add regression and security tests for relay quota and TLS stream handling

- Introduced regression tests for relay quota wake liveness to ensure proper handling of contention and wake events.
- Added adversarial tests to validate the behavior of the quota system under stress and contention scenarios.
- Implemented security tests for the TLS stream to verify the preservation of pending plaintext during state transitions.
- Enhanced the pool writer tests to ensure proper quarantine behavior and validate the removal of writers from the registry.
- Included fuzz testing to assess the robustness of the quota and TLS handling mechanisms against unexpected inputs and states.

src/proxy/middle_relay.rs

@@ -1653,3 +1653,7 @@ mod security_tests;
 #[cfg(test)]
 #[path = "tests/middle_relay_idle_policy_security_tests.rs"]
 mod idle_policy_security_tests;
+
+#[cfg(test)]
+#[path = "tests/middle_relay_desync_all_full_dedup_security_tests.rs"]
+mod desync_all_full_dedup_security_tests;