backend-common: avoid starting keepalive loop in tests

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

.changeset/four-parents-visit.md

@@ -0,0 +1,5 @@
+---
+'@backstage/backend-common': patch
+---
+
+Avoid starting database keepalive loop in tests.

.github/vale/Vocab/Backstage/accept.txt

@@ -180,6 +180,7 @@ jsx
 JWTs
 Kaewkasi
 Kaswell
+keepalive
 Keyv
 Knex
 Koyeb

packages/backend-common/src/database/DatabaseManager.ts

@@ -377,7 +377,9 @@ export class DatabaseManager {
         databaseClientOverrides,
         deps,
       );
-      this.startKeepaliveLoop(pluginId, client);
+      if (process.env.NODE_ENV !== 'test') {
+        this.startKeepaliveLoop(pluginId, client);
+      }
       return client;
     });