attempt to fix flaky test in IngestFromKinesisIT

[yupeng9]

Description

There's some flakiness of Kinesis integration tests, likely due to the fact that in LocalStack, the message propagation or availability might not be immediate. So when we immediately attempt to consume it, it might not be fully "visible" depending on timing, especially with a rewind to a precise AT_SEQUENCE_NUMBER. Tweaked the test with some more produced messages, and longer sleep so the records are committed and readable.

Ran the same tests 5 times locally, and test all passed.

[github-actions]

❌ Gradle check result for 17abbaf: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

❌ Gradle check result for b60c01b:

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

❌ Gradle check result for b60c01b:

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

❌ Gradle check result for b60c01b:

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

✅ Gradle check result for 7603930: SUCCESS

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.41%. Comparing base (399188f) to head (7603930).
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #17697      +/-   ##
============================================
- Coverage     72.46%   72.41%   -0.06%     
- Complexity    65855    65862       +7     
============================================
  Files          5322     5322              
  Lines        305477   305477              
  Branches      44312    44312              
============================================
- Hits         221359   221197     -162     
- Misses        66023    66133     +110     
- Partials      18095    18147      +52     

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