Remove slash package

[bluwy]

Changes

• Remove slash package
• Also remove unused supports-esm package (used to be used in the CLI)

The slash package doesn't do much unique except handling windows extended length path, which in a lot of case we don't need to. In some places, we're also doing slash('...').replace(/\\/g, '/') which nullifies slash altogether.

I've moved this utility to @astrojs/internal-helpers/path instead, and for tests, used a manual replace(/\\/g, '/') to reduce package dependencies.

Testing

Existing test should pass

Docs

n/a

[changeset-bot]

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Latest commit: 310942c

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[natemoo-re]

Great work!