[Protractor] Remove packages/ceph-storage-plugin/integration-tests

`frontend/packages/ceph-storage-plugin` has been migrated to a dynamic plugin in an external repo, so all the code there is orphaned. Included in that orphaned code are Protractor tests that need to be removed in order to complete the removal of Protractor.

AC:

• remove `frontend/packages/ceph-storage-plugin/integration-tests`
• remove `consolePlugin.integrationTestSuites` from `frontend/packages/ceph-storage-plugin/package.json`