The Browser Toolbox currently debug all scripts in a given content process
via the related Content Process Target actor.
Because of this, we have to ignore the WindowGlobal Target actors
for anything related to Sources, breakpoints,...
But VS.Code would benefit from reusing the Browser Toolbox codepath,
while never using the Content Process targets (which have no real meaning for the user in VS.code),
and instead debug the sources via the WindowGlobal Target actors.
Introduce a new configuration to be able to distinguish the two codepaths.
Differential Revision: https://phabricator.services.mozilla.com/D235681
c684086c38