fix(color-picker): Disable submit button when custom hex is invalid

[kennethjang34]

Summary

Fixes: #887

Release Category

Components

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Checklist

• Label ready for review has been added to PR

For the Reviewer

• PR title is short and descriptive
• PR summary describes the change (Fixes/Resolves linked correctly)

Where Should the Reviewer Start?

/modules/preview-react/color-picker/lib/ColorPicker.tsx

Areas for Feedback? (optional)

• Code
• Documentation
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Screenshots or GIFs (if applicable)

[cypress]

2 flaky tests on run #6102 ↗︎

0

941

2

0

2

Details:

Merge 3d726c6 into 55c53bf...
Project: canvas-kit	Commit: 55029f6c9a ℹ️
Status: Passed	Duration: 08:10 💡
Started: Sep 1, 2023 11:39 PM	Ended: Sep 1, 2023 11:47 PM

  Tabs.spec.ts • 1 flaky test

View Output Video

Test		Artifacts
... > when the "More" button is clicked > should show the Tab overflow menu		Output Screenshots Video

  Autocomplete.spec.ts • 1 flaky test

View Output Video

Test		Artifacts
... > when a value is entered > when down arrow key is pressed > when the user presses the enter key > when the use hits the "2" key > should change the filtered results		Output Screenshots Video

_{This comment has been generated by cypress-bot as a result of this project's GitHub integration settings.}