Delete lib/OptimizationNonconvex directory to avoid unnecessary compa…

[Vaibhavdixit02]

…t PRs

Checklist

• [ ] Appropriate tests were added
• [ ] Any code changes were done in a way that does not break public API
• [ ] All documentation related to code changes were updated
• [ ] The new code follows the contributor guidelines, in particular the SciML Style Guide and COLPRAC.
• [ ] Any new documentation only uses public API

Additional context

Add any other context about the problem here.

[codecov[bot]]

Codecov Report

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

Comparison is base (c64d6ef) 7.47% compared to head (b230b5f) 8.17%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #646 +/- ## ========================================= + Coverage 7.47% 8.17% +0.70% ========================================= Files 40 30 -10 Lines 2730 2494 -236 ========================================= Hits 204 204 + Misses 2526 2290 -236 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.