test(tree): Fix and re-enable text op size benchmarks

[Josmithr]

The allowed variance was not accounting for the largest test variant, which is not run in correctness mode (and therefore was not caught by CI).

[github-actions]

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• Correctness — logic errors, race conditions, lifecycle issues
• Security — vulnerabilities, secret exposure, injection
• API Compatibility — breaking changes, release tags, type design
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• Testing — coverage gaps, hollow tests

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[Copilot]

Pull request overview

This PR re-enables the TextDomain benchmark suite after adjusting the op-size variance allowance for the largest benchmark variant.

Changes:

• Re-enables TextDomain benchmarks by removing describe.skip.
• Increases the allowed max delta for remove-op size checks from 5 to 6 bytes.

[CraigMacomber]

Do we have a work item for this?

[Josmithr]

Not to my knowledge. I can make one though.