[ChangeFeedProcessor]ExhaustAllRetriesBeforePollDelay

[xinlian12]

Fixes issue #34901

Issue:
Expected behavior:

• Read the change feed.
• If there are no changes, sleep for a predefined amount of time (customizable with options.setFeedPollDelay in the Builder) and go to step 1
• If there are changes, send them to the delegate.
• When the delegate finishes processing the changes successfully, update the lease store with the latest processed point in time and go to step 1

Current behavior:

• Read the change feed.
• If there are no changes, sleep for a predefined amount of time (customizable with options.setFeedPollDelay in the Builder) and go to step 1
• If there are changes, send them to the delegate.
• When the delegate finishes processing the changes successfully, update the lease store with the latest processed point in time and go to step 1
• Sleep for predefined amount of time then go to step 1.

Fixes:
Keep fetching left pages until response is 304(Not_Modified), then sleep for pollDelay time

[azure-sdk]

API change check

API changes are not detected in this pull request.

[kushagraThapar]

LGTM, thanks @xinlian12 - one minor suggestion.

[xinlian12]

/azp run java - cosmos - tests

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[milismsft]

looks good; thank you for adding the extensive E2E tests