Add a sleep to reduce the likelihood of eventual consistency issue (#11044) (#18566)

[upstream:0a5f3df75416c3ae6ac22d4352e535e50155dcbd]

Signed-off-by: Modular Magician <[email protected]>

Author: modular-magician

.changelog/11044.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+resourcemanager: added a 10s wait after `google_service_account_key` creation to attempt to mitigate eventual concistency issues resulting in a `Root resource was present, but now absent` error.
+```

google/services/resourcemanager/resource_google_service_account_key.go

@@ -147,6 +147,12 @@ func resourceGoogleServiceAccountKeyCreate(d *schema.ResourceData, meta interfac
 	if err != nil {
 		return err
 	}
+
+	// We can't guarantee complete consistency even after waiting on
+	// the results, so sleep for some additional time to reduce the
+	// likelihood of eventual consistency failures.
+	time.Sleep(10 * time.Second)
+
 	return resourceGoogleServiceAccountKeyRead(d, meta)
 }