[tests] Use a constant-length timestamp redaction for test determinism #6511
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Changes our "timestamp redaction" logic to ignore the original length of the input timestamp.
Timestamps are not always constant-width -- depending on the amount of trailing zeros, they can have variable stringified lengths. Unfortunately, this variability is at-odds with our goal of deterministic test output.
In this PR, we favor the deterministic output, to avoid test flaking: Variable space output logic is removed in favor of a stable redaction marker. Additionally, tests with different timestamp lengths are added to act as a regression against this particular flake.
Fixes #6509