Add DependencyLibrary to support test case/suite dependency (#1323)

Robot Framework DependencyLibrary allows creating dependency between
test cases and test suites. For example, if test A must be executed
before test B (because B expect some resources created by A),
but test A failed - then test B will not be executed.

Using DependencyLibrary often in our sequential tests can save run and
diagnostic time due to failed tests that were dependent on others.

This commit includes a first use of `Depends On Test` KW in:
420__model_serving.robot suite.

Signed-off-by: manosnoam <nmanos@redhat.com>

ods_ci/tests/Resources/Common.robot

@@ -2,6 +2,7 @@
 Library   SeleniumLibrary
 Library   JupyterLibrary
 Library   OperatingSystem
+Library   DependencyLibrary
 Library   Process
 Library   RequestsLibrary
 Library   ../../libs/Helpers.py

ods_ci/tests/Tests/400__ods_dashboard/420__model_serving/420__model_serving.robot

@@ -44,7 +44,7 @@ Verify Openvino_IR Model Via UI
     [Documentation]    Test the deployment of an openvino_ir model
     [Tags]    Smoke
     ...       ODS-2054
-        Create Openvino Models    server_name=${RUNTIME_NAME}    model_name=${MODEL_NAME}    project_name=${PRJ_TITLE}
+    Create Openvino Models    server_name=${RUNTIME_NAME}    model_name=${MODEL_NAME}    project_name=${PRJ_TITLE}
     ...    num_projects=1
     [Teardown]    Run Keyword If Test Failed    Get Modelmesh Events And Logs
     ...    server_name=${RUNTIME_NAME}    project_title=${PRJ_TITLE}
@@ -54,6 +54,7 @@ Test Inference Without Token Authentication
     ...                Intermittently failing: RHOAIENG-3115
     [Tags]    Smoke    FlakyTest
     ...       ODS-2053
+    Depends On Test  Verify Openvino_IR Model Via UI
     Run Keyword And Continue On Failure    Verify Model Inference    ${MODEL_NAME}    ${INFERENCE_INPUT_OPENVINO}
     ...    ${EXPECTED_INFERENCE_OUTPUT_OPENVINO}    token_auth=${FALSE}
     [Teardown]    Run Keyword If Test Failed    Get Modelmesh Events And Logs