Follow-up from "Add partition_id to PipelineCreatedEvent properties"

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The following discussion from !210627 (merged) should be addressed:

• @lma-git started a discussion:

  Follow-up:

  We need to follow a multi-milestone approach when adding event properties.

  In the next milestone, update partition_id to be required in PipelineCreatedEvent. Update related code so that it always expects partition_id.