fix pulsar reader calls

[nlu90]

Please add a meaningful description for your change here
Fix the usages of Pulsar Reader API

1. readNext will block forever if no timeout provided
2. hasReachedEndOfTopic only apply to a "terminated" topic

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Reminder, please take a look at this pr: @kennknowles @johnjcasey

[kennknowles]

R: @johnjcasey

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Stopping reviewer notifications for this pull request: review requested by someone other than the bot, ceding control

[johnjcasey]

why did you choose 5 seconds here?

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[hpvd]

added this to [Parent issue] Support for Apache Pulsar #31078