Various fixes for TS worker's kitchen sink/throughput stress workflow

[THardy98]

What was changed

Various fixes for TS worker's kitchen sink/throughput stress workflow

• set correct activity timeout values (no 0 values)
• add search attributes to child workflows so visibility check passes
• fix pass through payload converter to simply pass through payloads (was breaking on its fromPayload path because no encoding was set, and it did not keep what encoding the payload was prior to encoding. But we don't need to encode at all 😃)

Why?

Allows usage of TS worker when running throughput_stress. To be used for future smoke/stress testing.

2. How was this tested:
   Able to run:

go run ./cmd run-scenario-with-worker \
    --scenario throughput_stress \
    --language typescript \
    --iterations 10 \
    --option internal-iterations=10

which failed before

3. Any docs updates needed?
   No

[mjameswh]

LGTM