Bug 35219: Fix ERM usage endpoints to show in docs

Bug 35219: Fix ERM usage endpoints to show in docs

This patch fixes the tags and also adds the tags to the swagger.yaml
file to allow the endpoints to be documented correctly.

One endpoint has also been deleted as it is no longer required.

Test plan:
Check the attached files to see that all tags are now prefixed with
'erm_' and that the swagger file now includes an entry for all of these
files

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>