fix: handling validation errors in approach/code generation

[gasolima]

Problem

When a validation errors(repo size exceeds limit or corrupted zip file) thrown from approach/code generation it will show generic internal error to the user

Solution

Catch those errors and show proper errors

REMINDER:
- Read CONTRIBUTING.md first.
- Add test coverage for your changes.
- Update the changelog using `npm run newChange`.
- Link to related issues/commits.
- Testing: how did you test your changes?
- Screenshots (if the pull request is related to UI/UX then please include light and dark theme screenshots)

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License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[justinmk3]

CI failing. Also needs a rebase.