Remove dependency on puppet-monasca

... because puppet-monasca is being retired.

Conflicts:
        Puppetfile
	zuul.d/base.yaml

Backport note:
- Resolved conflict caused by branch overrides.
- This backport includes the follow-up commit[1] to remove leftover.

[1] f45e67023c

Change-Id: Ieba1856f60479b04db6f93a26a22e720c0179ba5
(cherry picked from commit 25009d7f3a)
(cherry picked from commit 7c2355740b)
(cherry picked from commit 370d3724ff)
(cherry picked from commit 9ea47a0b83)

Puppetfile

@@ -65,10 +65,6 @@ mod 'mistral',
   :git => 'https://opendev.org/openstack/puppet-mistral',
   :ref => 'stable/train'
 
-mod 'monasca',
-  :git => 'https://opendev.org/openstack/puppet-monasca',
-  :ref => 'stable/train'
-
 mod 'murano',
   :git => 'https://opendev.org/openstack/puppet-murano',
   :ref => 'stable/train'

zuul.d/base.yaml

@@ -40,8 +40,6 @@
         override-checkout: stable/train
       - name: openstack/puppet-mistral
         override-checkout: stable/train
-      - name: openstack/puppet-monasca
-        override-checkout: stable/train
       - name: x/puppet-modulesync-configs
       - name: openstack/puppet-murano
         override-checkout: stable/train