Remove remaining t.Fatal from the codebase (#13876)

* Remove remaining t.Fatal from the codebase

* Fix job_store test

* Address review comments

* Remove comments

api4/apitestlib.go

@@ -169,7 +169,7 @@ func (me *TestHelper) ShutdownApp() {
 	select {
 	case <-done:
 	case <-time.After(30 * time.Second):
-		// panic instead of t.Fatal to terminate all tests in this package, otherwise the
+		// panic instead of fatal to terminate all tests in this package, otherwise the
 		// still running App could spuriously fail subsequent tests.
 		panic("failed to shutdown App within 30 seconds")
 	}