feat(bazel/karma): expose karma web test rule in shared karma code
feat(bazel/karma): expose karma web test rule in shared karma code

We should re-export the unmodified karma web test macro/rule in the
dev-infra Karma shared code so that a single import in consumer
repositories like framework is sufficient. Currently framework
would need to import from `@bazel/concatjs` and from `dev-infra-private/bazel/karma`
to get access to the Karma Bazel rules/macros.

angular/dev-infra,angular/dev-infra,angular/dev-infra,angular/dev-infra