Gutenberg: v19.4.x plugin upgrade

[gutenberg-plugin-upgrade-bot]

Previous upgrade: #94696
Release notes: v19.4.0

Install and activate

• Install and activate v19.4.0-rc.1 on edge (D163158-code)
• Install and activate v19.4.0 on edge (D163486-code)
• Activate v19.4.0 on production (D163487-code)
• Request v19.4.0 AT upgrade (######-p2) p1728645546440139-slack-CBTN58FTJ

Testing

• v19.4.0 Desktop viewport E2E
• v19.4.0 Mobile viewport E2E
• v19.4.0 WPCOM core (D163487-code)

Publish internal announcements

• Slack: #team-calypso (p1728652822426149-slack-C7YPUHBB2)
• Slack: #dotcom-happy-announce (p1728651938852679-slack-CB0B2G43X)
• P2: wpcomhappy (p7DVsv-lxw-p2)

Wrap-up

• Clean up unused releases D163668-code [Transferred https://github.com/Gutenberg: v19.5.x plugin upgrade #95318]
• Add log entry to the Gutenberg Upgrade Log (pcoGjb-g-p2) pcoGjb-3E-p2
• Open a new issue for the next upgrade, transfer remaining tasks, close this issue.

Blockers 🤷‍♀️

Other Issues 🐛

Issues transferred from previous release(s)

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cc @Automattic/gutenberg-upgrades

[gutenberg-plugin-upgrade-bot]

Automated update:

• v19.4.0-rc.1 activation on edge marked as complete.
• Release notes updated to v19.4.0-rc.1

[gutenberg-plugin-upgrade-bot]

Automated update:

• v19.4.0 activation on edge marked as complete.
• Release notes updated to v19.4.0
• Updated the diff used for v19.4.0 core tests

[gutenberg-plugin-upgrade-bot]

Automated update:

• v19.4.0 activation on production marked as complete.
• Release notes updated to v19.4.0

[gutenberg-plugin-upgrade-bot]

Automated update:
v19.4.0 is available at https://github.com/Automattic/gutenberg-dotcom-woa-releases/releases/tag/v19.4.0 for AT to pick up.