feat: remove useless vanilla test (#975) (#984)

* feat: skip flaky test

Signed-off-by: SuZhou-Joe <[email protected]>

* feat: remove useless test case

Signed-off-by: SuZhou-Joe <[email protected]>

* feat: remove useless reference

Signed-off-by: SuZhou-Joe <[email protected]>

---------

Signed-off-by: SuZhou-Joe <[email protected]>
(cherry picked from commit 1fa3e2b)

Co-authored-by: SuZhou-Joe <[email protected]>

Author: opensearch-trigger-bot[bot]

.github/workflows/cypress-workflow-vanilla-snapshot-based.yml

@@ -76,7 +76,7 @@ To run tests against a local cluster
 without security:
 
 ```
-$ yarn cypress:run-without-security --spec "cypress/integration/core-opensearch-dashboards/vanilla-opensearch-dashboards/*.js"
+$ yarn cypress:run-without-security --spec "cypress/integration/core-opensearch-dashboards/opensearch-dashboards/*.js"
 ```
 
 with security: