Allow data-astro-reload to take a value

[matthewp]

Changes

• Removes the diagnostic disallowing data-astro-reload from having a value.
• I don't know the context for why this was added, but it prevents people from making the property from being conditional, ala data-astro-reload={false}. As far as I know we don't care about the value on the front-end.
• https://github.com/withastro/compiler/issues/1006

Testing

• Updated the existing tests around this

Docs

N/A, bug fix

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 59fa57f32749cfa77283f331aa373220deb0a774

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ----------------- | ----- | | @astrojs/compiler | Patch |

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