fix(astro): do not open new tab when saving config files

[RickyC0626]

Changes

• Fixes If the -- open flag is used, any modifications to the packagist.json file will reopen the browser at this time #11374
• Running astro dev --open will no longer spawn extra tabs when saving config files

Testing

To reproduce the manual test locally:

Run build with changes

pnpm run build

Run astro dev

pnpm --filter astro dev

Test the changes using the following example:

pnpm --filter @example/minimal dev --open

Expected behavior:

• Open new tab on first run of dev command, then update the same tab on each file save
• Saving config files shouldn't spawn new tabs

Docs

Unexpected behavior has been fixed, no additional docs needed

[changeset-bot]

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Latest commit: dfeae94

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[RickyC0626]

@florian-lefebvre

[bluwy]

LGTM. fwiw it's not a problem in macos as it's possible to use an applescript to reuse the existing tab, but not possible (i think?) for other OSes.