fix: pass namespaceId when deleting discovery config

[wy471x]

The backend now requires namespaceId on DELETE /discovery/{discoveryId} (implemented as @RequestParam). Without it, deleting a discovery config from the UI returns 400.

• handleConfigDelete in the Discovery page now passes namespaceId: currentNamespaceId in the dispatch payload.
• deleteDiscovery sends namespaceId as a query param instead of a body.

insertOrUpdate already passes namespaceId, so it is unaffected.

related pr: #7007

[Copilot]

Pull request overview

Updates the dashboard’s Discovery deletion flow to satisfy a backend contract change requiring namespaceId on DELETE /discovery/{discoveryId} (as a query @RequestParam), preventing 400 responses when deleting discovery configs from the UI.

Changes:

• Passes namespaceId: currentNamespaceId when dispatching the discovery/deleteConfig action from the Discovery page.
• Updates deleteDiscovery to send namespaceId as a query parameter (instead of in a request body) on the DELETE call.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/services/api.js	Sends namespaceId via query string for DELETE /discovery/{id} to match backend requirements.
src/routes/Plugin/Discovery/index.js	Includes currentNamespaceId in the delete-config dispatch payload so the API layer can include it.

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