Self Observability can't start up when using MySQL storage

The table name is too long, reported by https://lists.apache.org/thread.html/r68b6f44f953f1bd9f2718a82f4bd1a8fea2a6c6e7d5b70e3cc9e8276%40%3Cdev.skywalking.apache.org%3E

Please adjust the name, and dashboard configuration. Also, need to add MySQL storage into the e2e, @kezhenxu94 we don't have that yet, right?

And Self Observability should be tested in the e2e.