fix: decrease retry timer of confsyncjob to 15s

- we need a rather long duration so we don't add a new job while was is
already planned to be runned, and they end up both running at the same
time.
- we also need a not too long duration for integration tests and UX
  experience, as a change could take the retry timeout to happen+polling
timer to happen, which used to be 40s total.

This brings that time to worse time change from 40 to 25s

ts/session/utils/job_runners/jobs/ConfigurationSyncJob.ts

@@ -20,7 +20,7 @@ import { ReleasedFeatures } from '../../../../util/releaseFeature';
 import { allowOnlyOneAtATime } from '../../Promise';
 import { isSignInByLinking } from '../../../../util/storage';
 
-const defaultMsBetweenRetries = 30000; // a long time between retries, to avoid running multiple jobs at the same time, when one was postponed at the same time as one already planned (5s)
+const defaultMsBetweenRetries = 15000; // a long time between retries, to avoid running multiple jobs at the same time, when one was postponed at the same time as one already planned (5s)
 const defaultMaxAttempts = 2;
 
 /**