Introduce config.globalScripts. Tests from the matching files will run
before all projects. We'll only allow beforeAll/afterAll instead of
tests in such files (next PR).
Global scripts are executed as part of 'Global Scripts' project which is
not present in FullConfig.projects but may be referenced by
corresponding global setup Suites.
Signed-off-by: Yury Semikhatsky <yurys@chromium.org>
Co-authored-by: Dmitry Gozman <dgozman@gmail.com>
