new: Add Lab 2.12 release notes

[tonilastre]

Description

Release notes for Lab 2.12.

Pull request type

Please check what kind of PR this is:

• [x] Fix or improvement of an existing page

Related PRs and issues

PR this doc page is related to: Lab 2.12.

Checklist:

• [x] Check all content with Grammarly
• [x] Perform a self-review of my code
• [x] Make corresponding changes to the rest of the documentation (consult with the DX team)
• [x] The build passes locally
• [x] My changes generate no new warnings or errors
• [x] Add a corresponding label
• [x] If release-related, add a product and version label
• [x] If release-related, add release note on product PR

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Name	Status	Preview	Comments	Updated (UTC)
documentation	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 28, 2024 3:16pm

[tonilastre]

@Ana-Marija-design feel free to check out the release notes and recommend any changes :)

[kgolubic]

Thank you both! I'll merge this soon.