[BUG] Delete Dashboard not working after Integrated Plugin feature

[pjfitzgibbons]

Describe the bug

Can't delete Dashboards w/ new Integrated Plugin feature.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Dashboards / Dashboards' (The list view)
2. Click on 'Checkbox any "Dashboard" type item'
3. Click on "Delete [n] Dashbaords" (red box next to search)
4. See error toast
5. Also see failed POST in Networking tool, and Console logged error

Expected behavior
Successful delete and item removed from list immediately.

OpenSearch Version
2.x (main)

Dashboards Version
2.x (main)

Plugins

Observability

Screenshots

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Host/Environment (please complete the following information):

• OS: [e.g. iOS]
• Browser and version [e.g. 22]

Additional context

Add any other context about the problem here.