Use for:range in go test files

[dmuli]

Description

Go 1.22 introduced the ability to range over integers in a more concise manner, e.g.

for i := 0; i < n; i++

becomes

for i := range n

Did the change for all go test files.

My first commit on this repo.

Related Issue(s)

#15193

Checklist

• "Backport to:" labels have been added if this change should be back-ported to release branches
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• Documentation was added or is not required

Deployment Notes

N/A

[vitess-bot]

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[deepthi]

@dmuli welcome and thank you for the contribution. This project requires commits to be signed off. You can fix the commit in this PR by doing git commit --amend --signoff followed by a force-push.
Please review our contributing guide and make sure you have followed those guidelines.
Setting up your development environment according to that guide should install a git hook that does the signoff automatically. If that is not the case, please let us know so that we can investigate and fix it.
One of our maintainers will review this PR, and if it looks reasonable, we'll run CI on it at that time.

[dmuli]

My tests cases on local are failing with the following error

main_test.go:80:
               Error Trace:    /Users/dhananjay/develop/vitess/go/cmd/vttestserver/cli/main_test.go:80
               Error:          Received unexpected error:
                               signal: killed
               Test:           TestPersistentMode

I am trying to fix these.