Stop ESLint errors from blocking compilation

[jkempster34]

Description

Stop ESLint errors from blocking compilation

Motivation and Context

There is a known bug where ESLint errors will prevent React compiling. This is really annoying when developing, as even an unused import will result in an error (see image below). react-scripts 4.0.3 has fixed this but requires setting the ESLINT_NO_DEV_ERRORS environment variable.

Screenshots (if appropriate):

Before change (error showing in browser):

After change (warning in console only):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[github-actions]

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