chore(util-user-agent-browser): remove bowser from default UA provider

[kuhe]

Issue

internal JS-6266

Description

• replaces the browser SDK-UA detection with navigator userAgentData when possible, or else a basic UA string parser
• bowser based legacy parsing behavior is available by an override explained in the package readme

This saves about 20kb pre-compression that was taken up by bowser.

Testing

Manual testing with local web app using both the new and the legacy UA providers.

Checklist

• If the PR is a feature, add integration tests (*.integ.spec.ts).
• If you wrote E2E tests, are they resilient to concurrent I/O?
• If adding new public functions, did you add the @public tag and enable doc generation on the package?