This new `base-authoring-package` captures all the settings, which
turns of potentially fatal checks, in one place. This new package is
then used as a base for all the docs-watch related packages, rather
than dotting the settings in a variety of different packages. This also
has the benefit that the standard configuration for doc-gen is fatal
on failed checks by default.
PR Close#40479
This is to tidy up the `author-packagse`, which currently duplicates a
lot of the configuration in the main packages. We need to
DRY this up so that we don't fall foul of a change in one being missed in
the other.