Fix onMouseDown event propagation where antd Select component is used

[matt-koevort]

🤔 This is a ...

• [ ] New feature
• [x] Bug fix
• [ ] Demo update
• [ ] Component style update
• [ ] TypeScript definition update
• [ ] Bundle size optimization
• [ ] Performance optimization
• [ ] Refactoring
• [ ] Code style optimization
• [ ] Test Case
• [ ] README update
• [ ] Other (about what?)

🔗 Related issue link

💡 Background and solution

If the Cron component is rendered inside of a component that has MouseEvent handlers, clicking on a dropdown item causes the ancestor component's MouseEvent handler to trigger. For ancestor's like modals, this behaviour is not desirable as it causes the modal to close (in most circumstances).

Handling this by explicitly stopping event propagation for the antd Select component.

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• [x] Demo in storybook is updated/provided or not needed
• [x] TypeScript definition is updated/provided or not needed
• [x] Tests are updated and passed without a decrease in coverage
• [x] Format (lint & prettier) script passed
• [x] Build script is working
• [x] README API section is updated or not needed

[codecov[bot]]

Codecov Report

Patch coverage: 62.50% and project coverage change: -0.19 :warning:

Comparison is base (5d8585e) 84.75% compared to head (ec3d12e) 84.56%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #50 +/- ## ========================================== - Coverage 84.75% 84.56% -0.19% ========================================== Files 12 12 Lines 492 499 +7 Branches 197 198 +1 ========================================== + Hits 417 422 +5 - Misses 12 13 +1 - Partials 63 64 +1 ``` | [Impacted Files](https://codecov.io/gh/xrutayisire/react-js-cron/pull/50?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Xavier+Rutayisire) | Coverage Δ | | |---|---|---| | [src/components/CustomSelect.tsx](https://codecov.io/gh/xrutayisire/react-js-cron/pull/50?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Xavier+Rutayisire#diff-c3JjL2NvbXBvbmVudHMvQ3VzdG9tU2VsZWN0LnRzeA==) | `70.45% <50.00%> (-0.63%)` | :arrow_down: | | [src/fields/Period.tsx](https://codecov.io/gh/xrutayisire/react-js-cron/pull/50?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Xavier+Rutayisire#diff-c3JjL2ZpZWxkcy9QZXJpb2QudHN4) | `58.97% <100.00%> (+2.21%)` | :arrow_up: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Xavier+Rutayisire). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Xavier+Rutayisire)

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[xrutayisire]

Hello, thanks for the MR!

I let you handle prettier problems and also can you add a test to cover the bug you found?