[MSD benchmark] AuthZService: improve authz caching

[khaliqgant]

MSD benchmark PR recreated from Martian Code Review Bench.

Source PR: grafana#103633
Dataset: grafana
Original title: AuthZService: improve authz caching

What is this feature?

This PR contains several changes to allow users to fetch newly created dashboards and folders.

The changes are:

• on client side: remove the use of authLib cache when running authZ service in-proc
• on server side: add a denial cache to return quickly when we know that a user does not have permission on a specific resource
• on server side: if permission denial cache is not hit, and the requested resource is not found in cached permissions, requery permissions from the DB

Why do we need this feature?

Otherwise dash/folder creator can't access the dashboard/folder that they've just created.

Who is this feature for?

Grafana users

Which issue(s) does this PR fix?:

Fixes https://github.com/grafana/identity-access-team/issues/1316