remove cephfs volume support

[BBBmau]

Description

The release of v1.31 included the removal of cephfs volume support which was marked as deprecated in v1.28

v1.31 mention: https://kubernetes.io/blog/2024/08/13/kubernetes-v1-31-release/#removal-of-cephfs-volume-plugin

terraform-provider-kubernetes/kubernetes/structure_persistent_volume_spec.go

Lines 70 to 89 in 65f1a7d

	func flattenCephFSVolumeSource(in *v1.CephFSVolumeSource) []interface{} {
	att := make(map[string]interface{})
	att["monitors"] = newStringSet(schema.HashString, in.Monitors)
	if in.Path != "" {
	att["path"] = in.Path
	}
	if in.User != "" {
	att["user"] = in.User
	}
	if in.SecretFile != "" {
	att["secret_file"] = in.SecretFile
	}
	if in.SecretRef != nil {
	att["secret_ref"] = flattenLocalObjectReference(in.SecretRef)
	}
	if in.ReadOnly {
	att["read_only"] = in.ReadOnly
	}
	return []interface{}{att}
	}

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[JaylonmcShan03]

@BBBmau I can take this on for Q4 :)