Improvement: `checkForProjectNamespace` duplicated in three services instead of using existing `util.CheckForProjectNamespace`

[mdryaaan]

Problem:
Three service structs each define an identical private method checkForProjectNamespace(*corev1.Namespace) bool that does exactly the same check as the public util.CheckForProjectNamespace function that already exists in util/reconciliation_utility.go. Any change to this check must be made in four places instead of one. All three private methods use "Project" as a string literal whereas the util function correctly uses the util.ProjectKind constant.

Proposed Solution:
Delete the private method from all three services and replace each call site with util.CheckForProjectNamespace(namespace).

Type of Issue: improvement / refactor / duplicate code

✅ Expected Behavior

Each service calls the shared util.CheckForProjectNamespace helper instead of maintaining its own copy.

👎 Actual Behavior

ClusterService.checkForProjectNamespace, SliceConfigService.checkForProjectNamespace, and SliceQoSConfigService.checkForProjectNamespace each contain an identical method body. Any future change to the namespace label convention must be applied in four places.

✅ Proposed Solution

Remove the three private methods and replace each call site with util.CheckForProjectNamespace(namespace).

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