fix(helm): fix invalid YAML syntax and nil pointer in values.yaml

Updated domainLabels to be an empty array.
Issue:
The ceph-csi-rbd helm chart fails to install with the default values.yaml due to two issues:
YAML Syntax Error: The domainLabels key was defined with both an empty list [] and nested list items, which is invalid YAML and causes a parsing error: error converting YAML to JSON: yaml: line 373: did not find expected key.
Template Nil Pointer: The readAffinity block was commented out by default. However, the nodeplugin-daemonset.yaml template attempts to access .Values.readAffinity.enabled without a conditional check, leading to a nil pointer evaluation error.
Changes:
Fixed domainLabels syntax by removing the [] and providing the labels as valid, commented-out examples.
Uncommented the readAffinity block and set enabled: false by default to ensure the Helm templates can render successfully.

Signed-off-by: Keshav Soni <102344018+KeshavSoni2511@users.noreply.github.com>

Author: KeshavSoni2511

charts/ceph-csi-rbd/values.yaml

@@ -339,7 +339,7 @@ topology:
   # for CSI nodeplugins to advertise their domains
   # NOTE: the value here serves as an example and needs to be
   # updated with node labels that define domains of interest
-  domainLabels: []
+  domainLabels:
   # - topology.kubernetes.io/region
   # - topology.kubernetes.io/zone