[Feature Request]: Add max_read_time to ReadFromPubsub similar to ReadFromKafka

[derrickaw]

What would you like to happen?

• Add max_read_time similar to ReadFromKafka
• Add publish_time to the post commit test - Add publish_time_field to ReadFromPubSub YAML transform #38985 for reference

Issue Priority

Priority: 2 (default / most feature requests should be filed as P2)

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