release-24.1: kvnemesis: ignore SysBytes:{,-}10 MVCC stats discrepancy

[blathers-crl]

Backport 1/1 commits from #131446 on behalf of @arulajmani.

/cc @cockroachdb/release

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We started ignoring these in 398dfc7. However, that commit was effectively reverted when we addressed #93896 in 2d855d3. However, like 2d855d3 notes in its description, this was best effort. As such, this can still cause test flakes (e.g. #131187).

This patch effectively resurrects 398dfc7, but also additionally quietens SysBytes:-10 failure mdoes.

Epic: none

Release note: None

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Release justification: test-only change.

[blathers-crl]

Thanks for opening a backport.

Please check the backport criteria before merging:

• Backports should only be created for serious
  issues or test-only changes.
• Backports should not break backwards-compatibility.
• Backports should change as little code as possible.
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• Backports should not add new functionality (except as defined
  here).
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• All backports must be reviewed by the owning areas TL. For more information as to how that review should be conducted, please consult the backport
  policy.

If your backport adds new functionality, please ensure that the following additional criteria are satisfied:

• There is a high priority need for the functionality that cannot wait until the next release and is difficult to address in another way.
• The new functionality is additive-only and only runs for clusters which have specifically “opted in” to it (e.g. by a cluster setting).
• New code is protected by a conditional check that is trivial to verify and ensures that it only runs for opt-in clusters. State changes must be further protected such that nodes running old binaries will not be negatively impacted by the new state (with a mixed version test added).
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• Your backport must be accompanied by a post to the appropriate Slack
  channel (#db-backports-point-releases or #db-backports-XX-X-release) for awareness and discussion.

Also, please add a brief release justification to the body of your PR to justify this
backport.

[cockroach-teamcity]

This change is