[FEATURE] Support batch actions on Workflow List page

[ohltyler]

Currently, workflows can only be deleted one-by-one from the UI, which is cumbersome if you are trying to clean up a cluster. We should support some batch deletion operation, to select a subset of workflows from the list, and perform deletion on them.

Can update the table to support selection: https://oui.opensearch.org/1.6/#/tabular-content/tables#adding-selection-to-a-table

We may start with just a deletion action, but the UI & design should be general for handling other actions in the future, such as batch provisioning or deprovisioning.

The anomaly detection list page is a good reference/pattern for handling batch actions.

One other consideration: currently, for deletion, we offer deleting the workflow + its resources (if provisioned), or just the workflow. Need to come up with a clean design for handling this at a per-workflow level, even if multiple are selected.