Adding namespaceClusterFbCfg to ClusterFluentBitConfig custom resource.

[btalakola]

Deploy fluent-bit configmap and secret in the namespace provided in the namespaceClusterFbCfg which is used in ClusterFluentBitConfig customresource > spec section. If it is not defined, they are created in the namespace of the fluent-operator.
Signed-off-by: Bharathi Talakola [email protected]

What this PR does / why we need it:

At present "fluent-bit-config" secret is getting created in the fluent-operator namespace by default. It can be configured using "namespace" key from ClusterFluentBitConfig CRD but this namespace key is not configured at the CR level.
https://github.com/fluent/fluent-operator/blob/release-3.2/charts/fluent-operator/charts/fluent-bit-crds/crds/fluentbit.fluent.io_clusterfluentbitconfigs.yaml#L191-L231.
Hence added namespace field to ClusterFluentBitConfig customresource > spec section.

Which issue(s) this PR fixes:

Fixes: #1365

Does this PR introduced a user-facing change?

None

Additional documentation, usage docs, etc.:

apiVersion: fluentbit.fluent.io/v1alpha2
kind: ClusterFluentBitConfig
metadata:
  name: fluent-bit-config
  labels:
    app.kubernetes.io/name: fluent-bit
spec:
  namespace: "fluentbit-namespace"