Limit rule type creation via HTTP APIs per project

[kobelb]

Feature Description

Different Serverless projects will support different alerting rules. In addition to the UIs only displaying the relevant alerting rules, the HTTP APIs should prevent unsupported alerting rules from being created. Serverless project alerting rule types lists which alerting rules should be available in which serverless projects.

Definition of Done

• Subset of alerting rules can only be created using the HTTP API for Serverless projects
• Serverless e2e test verify only the appropriate alerting rules can be created

[elasticmachine]

Pinging @elastic/response-ops (Team:ResponseOps)