Description of problem:

When creating lokistack via Console, when choosing CA ConfigMap Key, it shows the configmap names not the key names in the configmap. 

CA ConfigMap Key:  

CA ConfigMap Name:  

Version-Release number of selected component (if applicable):

loki-operator.v5.6.0

How reproducible:

Always

Steps to Reproduce:

1. subscribe loki-operator
2. create a configmap to contain the CA file in the project where the lokistack will be created in
3. create a secret for lokistack to connect to object storage
4. create lokistack via console,  configure via Form view, set TLS Config under Object Storage 
5. choose CA ConfigMap Key

Actual results:

When choosing CA ConfigMap Key, it lists the configmap names

Expected results:

It should allow users to input CA ConfigMap Key name

Additional info: