[SecuritySolution][ProductFeaturesService] Add support for new `requiredPrivileges` security route option

[semd]

Summary

After introducing the security route option [here], we need to add support for this new configuration in the Product Features route check.

The Product Feature route control ensures the route is available and included in the current product tier the application is running, this logic is implemented using http.registerOnPostAuth, as part of the ProductFeatureService at:

https://github.com/elastic/kibana/blob/0dada14ac580088b24a084d1d1b61b08a7055ebb/x-pack/plugins/security_solution/server/lib/product_features_service/product_features_service.ts#L134-L164

Task

• Add support for the new requiredPrivileges route security config in the ProductFeatureService route control (it can be retrieved using request.security.authz.requiredPrivileges)
• Keep support for the old access:* tags method as well. When the route configs migration is finished and the access:* tags are deprecated we'll be able to remove the code related to access:* tags in the ProductFeatureService.
• The securitySolutionProductFeature: tag feature should remain unchanged. It's unrelated to this task.

Related issue: https://github.com/elastic/kibana/issues/184674

[elasticmachine]

Pinging @elastic/security-solution (Team: SecuritySolution)