Prepare 1.2.0 release

[felixarntz]

No description provided.

[github-actions]

The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

If you're merging code through a pull request on GitHub, copy and paste the following into the bottom of the merge commit message.

Co-authored-by: felixarntz <flixos90@git.wordpress.org>
Co-authored-by: JasonTheAdams <jason_the_adams@git.wordpress.org>

To understand the WordPress project's expectations around crediting contributors, please review the Contributor Attribution page in the Core Handbook.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.41%. Comparing base (7dd7316) to head (fc3c1f7).
⚠️ Report is 2 commits behind head on trunk.

Additional details and impacted files

@@            Coverage Diff            @@
##              trunk     #211   +/-   ##
=========================================
  Coverage     87.41%   87.41%           
  Complexity     1189     1189           
=========================================
  Files            60       60           
  Lines          3846     3846           
=========================================
  Hits           3362     3362           
  Misses          484      484           

Flag	Coverage Δ
unit	87.41% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.