[Fix] cleanup for the dashboard api tests

The cleanup only checked for resources of two users but in the tests
there are used three different users, so let's clean after all three.

ods_ci/tests/Tests/400__ods_dashboard/414__ods_dashboard_api.robot

@@ -835,21 +835,22 @@ Delete Dummy ConfigMaps
 Delete Test Notebooks CRs And PVCs From CLI
     [Documentation]     Stops all the notebook servers spanwed during a test by
     ...                 deleting their CRs. At the end it closes any opened browsers
-    ${CR_1}=   Get User CR Notebook Name    ${TEST_USER_3.USERNAME}
-    ${CR_2}=   Get User CR Notebook Name    ${TEST_USER_4.USERNAME}
-    ${test_crs}=   Create List     ${CR_1}   ${CR_2}
-    FOR   ${nb_cr}    IN  @{test_crs}
-        ${present}=     Run Keyword And Return Status   OpenshiftLibrary.Oc Get    kind=Notebook  namespace=${NOTEBOOK_NS}  name=${nb_cr}
+    ${test_usernames}=   Create List  ${TEST_USER.USERNAME}  ${TEST_USER_3.USERNAME}  ${TEST_USER_4.USERNAME}
+    FOR  ${username}  IN  @{test_usernames}
+        ${nb_cr}=   Get User CR Notebook Name    ${username}
+        ${present}=     Run Keyword And Return Status
+        ...    OpenshiftLibrary.Oc Get    kind=Notebook    namespace=${NOTEBOOK_NS}  name=${nb_cr}
         IF    ${present} == ${FALSE}
             Continue For Loop
         ELSE
             OpenshiftLibrary.Oc Delete    kind=Notebook    namespace=${NOTEBOOK_NS}    name=${nb_cr}
         END
     END
     Close All Browsers
+    ${PVC_ADMIN_USER}=   Get User Notebook PVC Name    ${TEST_USER.USERNAME}
     ${PVC_BASIC_USER}=   Get User Notebook PVC Name    ${TEST_USER_3.USERNAME}
     ${PVC_BASIC_USER_2}=   Get User Notebook PVC Name    ${TEST_USER_4.USERNAME}
-    ${test_pvcs}=   Create List     ${PVC_BASIC_USER}   ${PVC_BASIC_USER_2}
+    ${test_pvcs}=   Create List     ${PVC_ADMIN_USER}    ${PVC_BASIC_USER}    ${PVC_BASIC_USER_2}
     Delete Test PVCs     pvc_names=${test_pvcs}
 
 Set Username In Secret Payload