fix(3230): fix assigned remote trigger events

[yakanechi]

Context

#3230

Objective

Fix external events triggered by the same event to be combined into one event.
In addition, fix the behavior on restart as follows.

• External events created when restarted with an upstream event belong to the same groupEvent as the external event created by the event before the restart.
• A remote trigger from a downstream event to an upstream event belongs to the same groupEvent as the upstream event that created the restarted downstream event.

Start event(Upstream), Downstream event

Restart event(Upstream), Downstream event

Relatedly, A Issues has been resolved too.
#3177

References

#3230
#3177

License

I confirm that this contribution is made under a BSD license and that I have the authority necessary to make this contribution on behalf of its copyright owner.

[coveralls]

coverage: 95.202% (+0.02%) from 95.185%
when pulling 0b4369c on sonic-screwdriver-cd:fix-gropEventId
into ef31fca on screwdriver-cd:master.