Placement manager hard-codes resource name

[paulnebel]

Describe the bug
The Placement Manager hard-codes the resource name to 'couchdb' in 'couchdb/ci/templates/placementmanager.yaml', line 37, of this chart and in '/app/src/couch/couch.py', line 166, of the placement manager code. This means that if you use Placement Manager and name your resource anything other than 'couchdb' deployment fails.

Version of Helm and Kubernetes:
Helm: version.BuildInfo{Version:"v3.14.3", GitCommit:"f03cc04caaa8f6d7c3e67cf918929150cf6f3f12", GitTreeState:"clean", GoVersion:"go1.22.1"}
Kubernetes: 1.28

What happened:
Deployment failed due to my naming the resource something other than 'couchdb'.

What you expected to happen:
I expected the chart to deploy Couch to k8s and spread the shards across availability zones.

How to reproduce it (as minimally and precisely as possible):
Call your resource anything other than 'couchdb' and try to deploy with the value 'placementConfig: enabled: true'.

Anything else we need to know: