[No QA] Fix off by one error in optimistic distance rate name

[luacmartins]

Details

When we don't have any distance rates, we create it with name = Default rate, but when there's at least one rate with that name, the next optimistic name should be Default rate 1 which is the length of the list, not length + 1

Fixed Issues

#38798 (partial)

Tests

Pre-requisite: an admin of a Collect policy in NewDot with Distance Rates enabled

1. Go to workspace settings > Distance Rates
2. Create new rate
3. Create another rate with same value
4. Disable last created rate
5. Verify that it is saved and is working as expected.

• Verify that no errors appear in the JS console

Offline tests

N/A

QA Steps

Will be QAed with #38799, we just had a off by one error in that PR

• Verify that no errors appear in the JS console

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above
• I wrote clear testing steps that cover the changes made in this PR
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Screenshots/Videos

Android: Native

Android: mWeb Chrome

iOS: Native

iOS: mWeb Safari

MacOS: Chrome / Safari

MacOS: Desktop

[luacmartins]

We don't need C+ on this one

[melvin-bot]

@marcaaron Please copy/paste the Reviewer Checklist from here into a new comment on this PR and complete it. If you have the K2 extension, you can simply click: [this button]

[OSBotify]

✋ This PR was not deployed to staging yet because QA is ongoing. It will be automatically deployed to staging after the next production release.