fix(tests): raise migration-boot hook timeout pins to the 120s default (#900)

The 3.97.0-beta.0 release PR (#899) failed its backend Tests job on
slideshowPublic.test.js: bootCrmDb's full migration chain crossed the
suite's explicit 30s beforeAll timeout argument on a slow runner. #860
raised the config default and the jest.setTimeout pins to 120s, but
hook-ARGUMENT pins override the config default and were left behind —
same time-bomb, different syntax.

Every beforeAll that boots the migration chain and pinned 30s/60s is
raised to 120000 (16 suites). Untouched on purpose: the three suites
whose pinned hooks don't run migrations (webhookDelivery,
imageProcessor.storage, storageBackend) and publicQuotes' 30s pin on
the rate-limit lockout test — neither grows with the migration chain.

No test logic changed.

Co-authored-by: Paul Nothaft <[email protected]>

backend/__tests__/routes/slideshowAdmin.test.js

@@ -75,7 +75,7 @@ describe('admin Live Slideshow endpoints', () => {
     app.use((err, req, res, next) => {
       res.status(err.statusCode || err.status || 500).json({ error: err.message, code: err.code });
     });
-  }, 30000);
+  }, 120000);
 
   afterAll(async () => { await cleanup(); });