Migrate testbed VM couchapps to new deployment method

[goughes]

Impact of the new feature
Testbed Couchdb VMs would no longer rely on couchapps code packaged in the reqmgr2, workqueue, reqmon, acdcserver RPMs. The couchapps would be provided via a new deployment method tracked in issue #10216

Is your feature request related to a problem? Please describe.
Couchapp deployment is not fully functioning in k8s. For example, in the VM based deployment method, reqmgr2 and couchdb were installed on the same node and reqmgr2 couchapps could be pushed via localhost. This is not the case in k8s as reqmgr2 no longer resides on couchdb VMs.

Describe the solution you'd like
Make required changes to couchdb deploy/manage scripts to pull couchapps code from WMCore and push the couchapps.

Describe alternatives you've considered
Some documented here: #10216

Additional context
The Couchapp package, used to deploy couchapps does not support python3 #10303

[amaltaro]

@goughes Erik, isn't it a duplicate of #10216 ?

[goughes]

My vision for this was create the changes to the deployment scripts in #10216. Then validate on the VM testbed couch nodes (this issue). Finally, start running the script on the prod VM couch nodes (#10433). This issue and #10433 are really just for tracking the work to switch to the new method.

[goughes]

Testbed deployment with the updated couchapps deployment methods was successful. Closing this issue.