Integration test coverage

[ohltyler]

Initial integration tests should cover some basic flows:

1. Create workflow via import -> nav to details page
2. Create workflow via import (invalid UI metadata) -> nav to details page
3. Create workflow from template -> nav to details page -> run ingestion to create index
4. Create workflow from template -> nav to details page -> run ingestion to create index + ingest pipeline
5. Create workflow from template -> nav to details page -> skip ingestion
6. Create workflow from template -> nav to details page -> run ingestion to create some resources -> run search to create search pipeline
7. Create workflow from template -> nav to details page -> run ingestion -> delete resources
8. Details page - navigation between ingest -> search -> ingest etc. work as expected
9. Details page - save / undo buttons work as expected
10. Workflow list - view resources
11. Workflow list - delete workflow including resources
12. Workflow list - delete workflow not including resources

To integrate this plugin:

1. Onboard to https://github.com/opensearch-project/opensearch-dashboards-functional-test
2. Create a GHA workflow to trigger and run remotely - for an example, see AD plugin's workflow: https://github.com/opensearch-project/anomaly-detection-dashboards-plugin/blob/main/.github/workflows/remote-integ-tests-workflow.yml

[saimedhi]

#426
opensearch-project/opensearch-dashboards-functional-test#1586