fix(agents-api): Limit activities per worker, tune temporal config

[Ahmad-mtos]

[!IMPORTANT] Limit activities per worker to 100 and adjust Temporal configuration for improved performance.

• Behavior:
  • Set MAX_CONCURRENT_ACTIVITIES to 100 in worker.py to limit activities per worker.
  • Set MAX_CONCURRENT_WORKFLOW_TASKS to None in worker.py (default behavior).
• Configuration:
  • Update temporal-postgres.yaml to increase matching.rps to 600 (default 1200).
  • Increase limit.blobSize.error to 4MB, limit.historySize.error to 100MB, limit.historyCount.error to 100k, limit.numPendingActivities.error to 4000, and limit.numPendingChildExecutions.error to 4000 in temporal-postgres.yaml.

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