feat(workforce): add TaskUpdatedEvent to track task modifications

[coolbeevip]

Description

Fixes #3661

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[a7m-1st]

Thanks @coolbeevip for the PR and @waleedalzarooni for notifying me.
Just a quick overview it is a useful feature to have.
But last time I recall workforce has a logging mechanism; so I will see if it doesn't overlap and review the PR either today or tmrw 🫴 .

[fengju0213]

everything is fine！except a typo

[a7m-1st]

All right, LGTM. I realized the log system has been updated to reflect the latest architecture. So no issues 👍

[Wendong-Fan]

thanks @coolbeevip ! left some minor comment below

[Wendong-Fan]

thanks @coolbeevip !