Remove Unconditional time out wait for diagnostic. See expectNoMoreDiagnostics

[soulomoon]

It it not an easy job to remove this one. There are multiple states we need to monitor to wait for hls to settle.
After discussion with @michaelpj , we can replace the expectNoMoreDiagnostics's time out with following:

• restartQueue empty
• actionQueue empty
• sessionLoader Queue empty
• rebouncer done
• hls-graph database all running is done

What we need to do:

• Implement utility to wait for all runnning in hls-graph done #4301
• semantic shift for sessionLoader Queue and restartQueue, turn "remove then run" to "run then remove" and add waitting utility. #4309
• implement rebouncer done utility.
• refactor the test util to make use of the above.