Only enable eager activity start if dynamic config enables it and
workflow doesn't use versioning.
If a workflow _uses_ versioning, only allow eager activities which
intend to use a compatible version since a
worker is obviously compatible with itself and we are okay dispatching
an eager task knowning that there may be a
newer "default" compatible version.
Note that if `UseCompatibleVersion` is false, it implies that the
activity should run on the "default" version
for the task queue.
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Co-authored-by: David Reiss <[email protected]>
