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test: fix flaky TestIntegration_MRDScaleUpConnections#3

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fix-mrd-scaleup-flaky-test-2242440705306567336
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test: fix flaky TestIntegration_MRDScaleUpConnections#3
krishnamd-jkp wants to merge 2 commits into
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fix-mrd-scaleup-flaky-test-2242440705306567336

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Fixes flaky TestIntegration_MRDScaleUpConnections


PR created automatically by Jules for task 2242440705306567336 started by @krishnamd-jkp

The test was flaky because queueing all 100 requests at once could flood the event loop's
cmds channel, causing the select block to repeatedly pick the Add commands over the
connection add channel. This prevented the manager from tracking scaled-up streams
before the test completed.

This change batches the requests, giving the event loop natural breaks to process
stream creation deterministically without using non-deterministic sleeps.

Co-authored-by: krishnamd-jkp <230955344+krishnamd-jkp@users.noreply.github.com>
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The test was flaky because queueing all 100 requests at once could flood the event loop's
cmds channel, causing the select block to repeatedly pick the Add commands over the
connection add channel. This prevented the manager from tracking scaled-up streams
before the test completed.

This change batches the requests, giving the event loop natural breaks to process
stream creation deterministically without using non-deterministic sleeps. It also
reduces maxConnections from 3 to 2 for improved reliability.

Co-authored-by: krishnamd-jkp <230955344+krishnamd-jkp@users.noreply.github.com>
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