fix(v7): logger API no longer experimental

[ArmandPhilippot]

Description (required)

• Removes experimental from the logger API reference
• Adds logger to the upgrade guide
• Adds logHandlers to the astro/config module

Related issues & labels (optional)

• Suggested label: 7.0

For Astro version: 7.0. See astro PR #16745.

[astrobot-houston]

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en/guides/upgrade-to/v7.mdx	Localization changed, will be marked as complete.
en/reference/logger-reference.mdx	Localization changed, will be marked as complete.
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🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

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[ArmandPhilippot]

Haha, better late than never (the Netlify preview) 😅

I'm updating the broken link because it seems the heading is "Logger Options" and not "logger". But, anyway, we need to merge #14028 first!