[Dashboard] Fix incorrect actions in edit mode after discarding unsav…

…ed changes (#200230)

## Summary

Closes #197870.

The `isCompatible` check on the edit drilldown action was throwing an
unhandled promise error that prevented the actions for drilldown
compatible panels when trying to access `event` off an undefined
`dynamicActions` object. This ensures that `dynamicActions` is always a
defined object.

### Checklist

Check the PR satisfies following conditions. 

Reviewers should verify this PR satisfies this list as well.

- [ ] Any text added follows [EUI's writing
guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses
sentence case text and includes [i18n
support](https://github.com/elastic/kibana/blob/main/packages/kbn-i18n/README.md)
- [ ]
[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)
was added for features that require explanation or tutorials
- [ ] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
- [ ] If a plugin configuration key changed, check if it needs to be
allowlisted in the cloud and added to the [docker
list](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker)
- [ ] This was checked for breaking HTTP API changes, and any breaking
changes have been approved by the breaking-change committee. The
`release_note:breaking` label should be applied in these situations.
- [ ] [Flaky Test
Runner](https://ci-stats.kibana.dev/trigger_flaky_test_runner/1) was
used on any tests changed
- [ ] The PR description includes the appropriate Release Notes section,
and the correct `release_node:*` label is applied per the
[guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)

### Identify risks

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to test bugs, performance regression, potential of data loss.

Describe the risk, its severity, and mitigation for each identified
risk. Invite stakeholders and evaluate how to proceed before merging.

- [ ] [See some risk
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- [ ] ...

x-pack/plugins/embeddable_enhanced/public/plugin.ts

@@ -148,8 +148,8 @@ export class EmbeddableEnhancedPlugin
     );
     const api: DynamicActionStorageApi = {
       dynamicActionsState$,
-      setDynamicActions: (newState) => {
-        dynamicActionsState$.next(newState);
+      setDynamicActions: (enhancements) => {
+        dynamicActionsState$.next(getDynamicActionsState(enhancements));
       },
     };
     const storage = new DynamicActionStorage(uuid, getTitle, api);