[release-5.7] User can list labels and label values for all user workload namespaces via Loki Label APIs

$ oc login --token=****** --server=https://api.example.com:6443
Logged into "https://api.example.com:6443" as "myuser" using the token provided.

You have access to the following projects and can switch between them with 'oc project <projectname>':

project1
project2
...

## User 'myuser' have permission to 16 namespaces
$ oc get projects --no-headers | wc -l
16


## QUERY Data/Labels via Logcli

## logcli login via oc token
$ export LOKI_ADDR=https://logging-loki-openshift-logging.apps.example.com/api/logs/v1/application
$ export LOKI_BEARER_TOKEN=$(oc whoami -t)

## list lables
$ logcli labels
2023/01/05 16:43:57 https://logging-loki-openshift-logging.apps.example.com/api/logs/v1/application/loki/api/v1/labels?end=1672933437341483502&start=1672929837341483502
fluentd_thread
kubernetes_container_name
kubernetes_host
kubernetes_namespace_name
kubernetes_pod_name
log_type
tag

## Get labels
$ logcli labels
2023/02/23 20:02:05 https://logging-loki-openshift-logging.apps.example.com/api/logs/v1/application/loki/api/v1/labels?end=1677178925120970400&start=1677175325120970400
fluentd_thread
kubernetes_container_name
kubernetes_host
kubernetes_namespace_name
kubernetes_pod_name
log_type

## List all namespaces label values from the Cluster
$ logcli labels kubernetes_namespace_name
2023/02/23 20:02:15 https://logging-loki-openshift-logging.apps.example.com/api/logs/v1/application/loki/api/v1/label/kubernetes_namespace_name/values?end=1677178935787035238&start=1677175335787035238

<lists every namespace in cluster>