Autoscaler empty poll fix

[shijiesheng]

What changed?

• activityWorker poll should populate autoConfigHint
• workflowWorker poll additional field population. This is optional but is good to have it

Why?

Activity worker doesn't process auto config hint on empty polls

How did you test it?

Unit Test

Local Test with Cadence-Samples. Now it's scaling down correctly on empty poll scenarios

Also there is no panic/error logs in local testing

Potential risks

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.51%. Comparing base (6b9605b) to head (c894c5c).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Coverage Δ
internal/internal_task_pollers.go	86.07% <100.00%> (+2.57%)	⬆️

... and 1 file with indirect coverage changes

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