Add edgeFunctions to Netlify adapter devFeatures to allow disabling edge function emulation

[astrobot-houston]

Changes

• Adds edgeFunctions to the devFeatures adapter option so users can disable Netlify Edge Function emulation during astro dev. Some npm packages (e.g. node-html-parser) access the filesystem at initialization and fail inside the Deno sandbox with "Reading or writing files with Edge Functions is not supported yet." Setting devFeatures: { edgeFunctions: false } works around this — edge functions still work in production and via netlify dev.
• The new option defaults to true to preserve existing behavior.

Closes #17244

Testing

• No new tests added. The fix is a config passthrough to @netlify/vite-plugin's existing edgeFunctions.enabled option; existing integration tests already cover edge function emulation when enabled. Fix was verified against the reporter's reproduction repo.

Docs

• No docs update needed; the new option is documented in the JSDoc on NetlifyIntegrationConfig and in the changeset.

[changeset-bot]

🦋 Changeset detected

Latest commit: 16c0dfe

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

This PR includes changesets to release 3 packages

Name	Type
@astrojs/netlify	Patch
@test/netlify-session	Patch
@test/netlify-hosted-astro-project	Patch

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[paulrudy]

I wonder if there might be an alternative fix to #17244, other than the suggested one, which apparently disables edge functions altogether in astro dev.