fix: create secret only when provided

[cxdy]

Noticed this bug when upgrading the linode-ccm today (and trying to hot-load the API token)
Related PR: #576
Copy-cat PR for CSI: linode/linode-blockstorage-csi-driver#592

When updating to v0.9.7, I looked at the diff in ArgoCD and it didn't show the new Secret object, but the CSI (which I'm also updating) did show the new Secret object. Thought that was strange so we dug a little and noticed this:

linode-cloud-controller-manager/deploy/chart/templates/ccm-linode.yaml

Lines 1 to 11 in 373f204

	{{- if not .Values.secretRef }}
	apiVersion: v1
	kind: Secret
	metadata:
	name: ccm-linode
	namespace: {{ required ".Values.namespace required" .Values.namespace }}
	stringData:
	apiToken: {{ required ".Values.apiToken required" .Values.apiToken }}
	region: {{ required ".Values.region required" .Values.region }}
	type: Opaque
	{{- end }}

if not .Values.secretRef directly conflicts with what I'm trying to do. In the CSI PR, we did if not .Values.apiToken instead:
https://github.com/linode/linode-blockstorage-csi-driver/blob/main/helm-chart/csi-driver/templates/csi-secrets.yaml#L5-L15

Here's my valuesObject (same in both applications, only difference is csi-linode and ccm-linode for secretRef.name:

        valuesObject:
          region: {{ .Values.apiRegion }}
          apiToken: "<path:/vault/path/to/linode-api#token>"
          secretRef:
            name: "ccm-linode"
            apiTokenRef: "apiToken"
            regionRef: "region"
            mountSecret: true

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.76%. Comparing base (8e51020) to head (c85f9c1).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #594   +/-   ##
=======================================
  Coverage   73.76%   73.76%           
=======================================
  Files          19       19           
  Lines        3045     3045           
=======================================
  Hits         2246     2246           
  Misses        538      538           
  Partials      261      261           

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