Bump Chrome to the next stable release (84.0.4147) by following the
instructions in dev-infra/browsers/README.md.
With Chrome 86 about to be released as stable, the current local version
(Chrome 83) is starting to lag behind. It also contains a bug that
blocks Angular unit and integration tests from using Trusted Types.
PR Close#39179
Adds Firefox as browser to `dev-infra/browsers` with RBE
compatibility. The default Firefox browser is not compatible similar to
the default Chromium version exposed by `rules_webtesting`.
The Angular Components repository will use this browser target as
it enables RBE support. Also it gives us more flexibility about
the Firefox version we test against. The version provided by
`rules_webtesting` is very old and most likely not frequently
updated (based on past experience).
PR Close#38029