Consider incorporating sleep into e2e test

[juliev0]

Summary

The issue is that Numaflow uses Jobs to create buffers/buckets and delete them. This occurs whenever a Pipeline gets added (need to add buffers/buckets) and whenever a Pipeline gets modified as part of a topology change (need to both add buffers/buckets and delete them).

Since it's a Job, it could run at any time. We need to worry about the Job from a previous test running late and affecting another test.

The Numaflow issue is here.

(Note this issue is probably related only to ppnd and "no strategy" tests, since for progressive tests, we are creating a new pipeline/isbsvc (so the Jobs shouldn't affect each other)

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Message from the maintainers:

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[juliev0]

@whynowy @afugazzotto FYI