feat: added path too long check in both react and C#.

[JiayuW2]

Issue #, if available: V731980280

Description of changes:

• Added path too long check in both react and C#.

1. Frontend: added path too long check
2. C#: added path too long check for solutionPath and destinationPath
3. C#: added unit tests for solutionPath and destinationPath

Testing done:

• Added unit tests for C#.

Merge Checklist

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• [x] 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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