fix: add timeout to releasePromise in connection destroy path

releasePromise (e.g. DISCARD ALL) had no timeout in internalDestroy(),
causing connections to stay in PENDING_DESTROY indefinitely when the
database is unreachable. These connections count toward maximumPoolSize,
blocking the pool from creating new connections.

Author: gajus

.changeset/slick-falcons-cheer.md

@@ -0,0 +1,5 @@
+---
+"slonik": patch
+---
+
+add timeout to releasePromise in connection destroy path

packages/driver/src/factories/createDriverFactory.ts

@@ -262,17 +262,20 @@ export const createDriverFactory = (setup: DriverSetup): DriverFactory => {
 
           clearIdleTimeout();
 
-          if (activeQueryPromise) {
+          // activeQueryPromise and releasePromise are mutually exclusive
+          // (release throws if a query is active). Either one can hang if the
+          // database is unreachable (e.g. DISCARD ALL during release), causing
+          // the connection to stay in PENDING_DESTROY and count toward
+          // maximumPoolSize, which blocks the pool from creating new connections.
+          const pendingOperation = activeQueryPromise ?? releasePromise;
+
+          if (pendingOperation) {
             await Promise.race([
               delay(driverConfiguration.gracefulTerminationTimeout),
-              activeQueryPromise,
+              pendingOperation,
             ]);
           }
 
-          if (releasePromise) {
-            await releasePromise;
-          }
-
           isDestroyed = true;
 
           clientEventEmitter.emit('destroy');