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authz: update user emails and groups caches in perforce authz provider

Administrator requested to merge ao/perforce-authz-update-cache into main

Created by: sashaostrikov

Follow up to https://github.com/sourcegraph/sourcegraph/pull/38415

This PR adds updates of user emails and groups caches, which are currently only filled during application startup.

It uses mutexes to exclude the possibility of unexpected surprises (panics) in future due to concurrent operations on these maps when perforce code is more widely used.

Also two new methods of Provider are introduced: excludeGroupMembers and includeGroupMembers. They are added so that the code which accesses caches (and mutexes) is contained within Provider and perforce.go file.

Test plan

Existing test cases should pass

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