Fix expected response for adding kubeconfig

[olexii4]

Signed-off-by: Oleksii Orel oorel@redhat.com

What does this PR do?

Fix expected response for adding kubeconfig.

What issues does this PR fix or reference?

fixes eclipse-che/che#21480

Is it tested? How?

1. Deploy Eclipse CHE on k8s platform using chectl
2. Create a new workspace from one of the samples.
3. config file should be in ~/.kube/

$ ls ~/.kube/

4. Open swagger /dashboard/api/swagger and try to use 'Kube Config'
5. Response code should be 204

[che-bot]

Click here to review and test in web IDE:

[github-actions]

Docker image build succeeded: quay.io/eclipse/che-dashboard:pr-572

[openshift-ci]

@olexii4: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/v8-dashboard-happy-path	e553a18	link	true	/test v8-dashboard-happy-path

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: akurinnoy, ibuziuk, olexii4

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