[BREAKING CHANGE] Removing deprecated rules bulk CRUD API endpoints

[banderror]

Related to: elastic/kibana#193184
Pending approval in https://github.com/elastic/dev/issues/2772

Description

We are removing the following deprecated bulk API endpoints for creating, updating and deleting detection rules from Elastic Security APIs in Serverless GA and upcoming Stack v9.0.0:

Method	Endpoint
POST	/api/detection_engine/rules/_bulk_create
PUT	/api/detection_engine/rules/_bulk_update
PATCH	/api/detection_engine/rules/_bulk_update
DELETE	/api/detection_engine/rules/_bulk_delete
POST	/api/detection_engine/rules/_bulk_delete

Which deployment types are affected?

ESS and serverless

Release version

The endpoints will be removed from (not available in):

• Stack v9.0.0
• Serverless GA