TestFix: Upgrade Downgrade Testing - Backups - Manual

[GuptaManan100]

Description

This PR fixes the test Upgrade Downgrade Testing - Backups - Manual after it was found to be failing in release-16.0.

The fix entails reverting the changes in vttablet-up.sh file in #12791

Related Issue(s)

• Fixes Bug Report: Upgrade Downgrade Testing - Backups - Manual is failing on release-16.0 #13407

Checklist

• "Backport to:" labels have been added if this change should be back-ported
• Tests were added or are not required
• Did the new or modified tests pass consistently locally and on the CI
• Documentation was added or is not required

Deployment Notes

[vitess-bot]

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[shlomi-noach]

Always the throttler.