fix(FIFO): worker service manifest with fifo subscriptions

[paragbhingre]

This PR fix the following scenario for FIFO SNS and SQS. Initiate a new worker service and select FIFO topic for the subscriptions from the listed items and manifest gets populated with for example -

subscribe:
  topics:
    - name: orders.fifo
      service: api

Whereas in this scenario manifest should be -

subscribe:
  topics:
    - name: orders
      service: api
  queue:
    fifo: true

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