I split this PR off from my "create one DevTools universe per page" PR
in preparation. This allows tests to re-use browser instances without
creating an `McpContext`.
Drive-by: Move mocked browser/page into utils.ts.
This PR prevents license notices being dropped when creating package for
publication.
This can happen when first import in the file is type-only import that
gets removed during build. When there is no empty line between the
license block comment and such import, the comment is treated as related
to the import and gets removed alongside it.
Adding an empty line between copyright notice and the import fixes the
issue.
Co-authored-by: Piotr Paulski <piotrpaulski@chromium.org>
Simon Zünd