Breaking changes in v5 release

[jackfranklin]

This issue tracks what will make it into the v5 release and any breaking changes that we need to communicate in the release notes.

Breaking changes:

• removed page.emulateMedia (feat(api): remove emulateMedia method #6084). This has been deprecated for a long time and marked as such in the docs. Users need to swap to page.emulateMediaType.
• removed puppeteer/DeviceDescriptors as a supported import/require (chore: remove top level errors and DeviceDescriptors #6043). Users need to swap to puppeteer.devices.
• removed puppeteer/Errors as a supported import/require (chore: remove top level errors and DeviceDescriptors #6043). Users need to swap to puppeteer.errors.

[jackfranklin]

v5 is released.