Update sync trigger API to synch triggers differently for Durable 2.x (…

…Azure#5282)

A temporary fix to make sure that the correct task hub name is used by the scale controller for Durable 2.x when a task hub name is not specified. This fix can be made more simple once we make the scale controller more robust.

Changes to unification opt-in behavior

Merge branch 'dev' into v3.x

Merge branch 'dev' into v3.x

do not use placeholder worker if ~3 and v2 compatability enabled (Azu…

…re#5328)

* do not use placeholder worker if ~3 and v2 compatability enabled

* delete irrelevant comment

Node.js Worker 2.0.0 and Capability Flag (Azure#5321)

Update to Node.js Worker 2.0.0 and send appropriate capability flag

[pack]Update check for InStanbyMode. (Azure#5303)

[pack]Update check for InStanbyMode. (Azure#5303)

[pack]Update check for InStanbyMode. (Azure#5303)

Wait for HttpWorker to be ready before sending invocations (Azure#5195)