ci: update mergify config for labelling PRs
ci: update mergify config for labelling PRs

When the configuration for Mergify itself gets updated, there is not
need to run the e2e tests.

It seems that the `(ci)` part of matching a title for ci/testing PRs
would match partial words like 'capacity'. This is not intended, so
rephrasing the regex and adding `e2e` as match too.

Signed-off-by: Niels de Vos <7bda0c0ee7f47171cc808e9e60292cbc5d8140dd@redhat.com>

ceph/ceph-csi,ceph/ceph-csi,ceph/ceph-csi,ceph/ceph-csi