Use better higher threshold settings for storage access in tests

`failure_count_threshold`: We should never need this, but we don't
want to block access in tests because of this.

`failure_wait_time`: Setting it to 0 now allows each storage attempt

`storage_timeout`: Try a bit longer to access storage on CI in case
the slow machines take a bit longer to spin up the process to perfom
the check

config/gitlab.yml.example

@@ -649,6 +649,9 @@ test:
       default:
         path: tmp/tests/repositories/
         gitaly_address: unix:tmp/tests/gitaly/gitaly.socket
+        failure_count_threshold: 999999
+        failure_wait_time: 0
+        storage_timeout: 30
       broken:
         path: tmp/tests/non-existent-repositories
         gitaly_address: unix:tmp/tests/gitaly/gitaly.socket