Support import.meta.env in eslint-plugin-turbo (#7781)
### Description
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This adds support for `import.meta.env` in `eslint-plugin-turbo` so that
projects that access environment variables through `import.meta.env` can
benefit from this eslint plugin.
This addresses #5163
### Testing Instructions
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I've added more automated test cases.
Co-authored-by: Greg Soltis <greg.soltis@vercel.com>
