change: Add test to check classical indices used in measurement are preserved between Circuit and OpenQASM Translations.

[Altanali]

Issue #, if available:

Description of changes: Add a unit test to check that classical register indices supplied during qubit measurements are preserved when translating to and from Braket Circuits and OpenQASM 3.0.

Testing done:

Merge Checklist

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General

• [ ] I have read the CONTRIBUTING doc
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Tests

• [ ] I have added tests that prove my fix is effective or that my feature works (if appropriate)
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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (785d251) to head (f19b73a).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1013 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 135 135 Lines 8948 8948 Branches 2010 2010 ========================================= Hits 8948 8948 ```

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