[BeatsCM - NP] A way to check user roles in client and server

[mattapperson]

In the current platform, BeatsCM checks user roles to decide if a user has permissions to use BeatsCM. We do this because we want to be able to warn users in the UI before they get an error when trying to do something that they can not use beats for one of the following reasons:

• Security is not enabled
• The user does not have the correct roles.
  That is to say we do a pre-flight check in order to notify users immediately.

This is not something that is currently a planned API for the new platform, and is honestly not desirable behavior in general as it is bypassing platform security.

Potential fixes:

• Remove these checks, and instead do a pre-flight query of the BeatsCM created index to check for permissions. -- A Higher level of effort then is desirable for BeatsCM at this time, and would alter the security model of the project (even if it is to to improve it)
• Expose the needed APIs to new platform -- Not ideal and opens the door for other plugins to use a feature we would rather not continue to see used in the new platform.

Ideally, can find a low level of effort fix that could be easy to implement.

[elasticmachine]

Pinging @elastic/kibana-security (Team:Security)

[mattapperson]

// cc @restrry

[legrego]

Resolved via #67791