Release/804.0.0

[baptiste-marchand]

Explanation

Major release of @metamask/notification-services-controller to v22.0.0.

References

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

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Note

Low Risk
Version/changelog-only changes with no functional code modifications; risk is limited to release metadata correctness.

Overview
Bumps the monorepo release version to 804.0.0 and publishes @metamask/notification-services-controller as 22.0.0.

Updates the controller’s changelog for 22.0.0 and adjusts compare links to reflect the new release tag.

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