Description of problem: 

When non-admins users query for rules API or check for firing alerts on dev-console, they get unauthorized errors from observatorium API.

Error when querying rules API:

$ curl -k -H "Authorization: Bearer $(oc whoami -t)" "https://logging-loki-openshift-logging.apps.<hidden>/api/logs/v1/application/loki/api/v1/rules?kubernetes_namespace_name=my-app" {"error":"unauthorized access for URL parameter \"k8s_namespace_name\" and value \"\"","errorType":"observatorium-api","status":"error"}

Error when checking alerts:

Request URL:
https://console-openshift-console.apps.kbharti0605x.qe.devcluster.openshift.com/api/proxy/plugin/logging-view-plugin/backend/api/logs/v1/application/prometheus/api/v1/rules?kubernetes_namespace_name=testuser-0-app
{
    "error": "unauthorized access for URL parameter \"k8s_namespace_name\" and value \"\"",
    "errorType": "observatorium-api",
    "status": "error"
}

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

Logging 6.3.0

How reproducible:

Always

Steps to Reproduce:

1. Deploy CLO and LO v6.3.0
2. Create Alerting rules using non-admin user for the authorized namespace and create RBAC for namespace access.
3. Query for Alerting Rules or check for firing alerts.

Actual results:

observatorium-api error on rules query

Expected results:

No error should be thrown for these users since they are authorized to access the rules API and alertingrules/firing alerts.

Additional info:

No such error when querying using kube:admin