Gutenberg: v18.4.x plugin upgrade

[gutenberg-plugin-upgrade-bot[bot]]

Previous upgrade: #90219
Release notes: v18.4.1

Install and activate

• [ ] Install and activate v18.4.0-rc.1 on edge (######-code)
• [x] Install and activate v18.4.0 on edge (D149821-code)
• [x] Activate v18.4.0 on production (D149828-code)
• [x] Request v18.4.0 AT upgrade (######-p2)
• [x] Install and activate v18.4.1 on edge (D149975-code)
• [x] Activate v18.4.1 on production (D149977-code)
• [x] Request v18.4.1 AT upgrade (######-p2)

Testing

• [x] v18.4.0 Desktop viewport E2E
• [x] v18.4.0 Mobile viewport E2E
• [x] v18.4.0 WPCOM core (D149828-code)
• [x] v18.4.1 Desktop viewport E2E
• [x] v18.4.1 Mobile viewport E2E
• [x] v18.4.1 WPCOM core (D149977-code)

Publish internal announcements

• [x] Slack: #team-calypso
• [x] Slack: #dotcom-happy-announce
• [x] P2: wpcomhappy

Wrap-up

• [x] Clean up unused releases (D149838-code)
• [x] Add log entry to the Gutenberg Upgrade Log (pcoGjb-g-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[bot]]

Automated update: v18.4.0 is available at https://github.com/Automattic/gutenberg-dotcom-woa-releases/releases/tag/v18.4.0 for AT to pick up.

[gutenberg-plugin-upgrade-bot[bot]]

Automated update:

• v18.4.0 activation on edge marked as complete.
• Release notes updated to v18.4.0

[gutenberg-plugin-upgrade-bot[bot]]

Automated update:

• v18.4.0 activation on production marked as complete.
• Release notes updated to v18.4.0
• Updated the diff used for v18.4.0 core tests

[gutenberg-plugin-upgrade-bot[bot]]

Automated update: Added tasks for v18.4.1

[gutenberg-plugin-upgrade-bot[bot]]

Automated update:

• v18.4.1 activation on edge marked as complete.
• Release notes updated to v18.4.1

[gutenberg-plugin-upgrade-bot[bot]]

Automated update:

• v18.4.1 activation on production marked as complete.
• Release notes updated to v18.4.1
• Updated the diff used for v18.4.1 core tests

[gutenberg-plugin-upgrade-bot[bot]]

Automated update: v18.4.1 is available at https://github.com/Automattic/gutenberg-dotcom-woa-releases/releases/tag/v18.4.1 for AT to pick up.