Allow enabling and disabling admin features

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Hello!

It could be nice to have something to disabled completly admin part on a node.

Config example

api["admin_features_enable"] = false
# or
web["admin_features_enable"] = false

or via rails

gitlab_rails["api_features_enable"] = false
gitlab_rails["web_features_enable"] = false

Disabling api admin features will disable some standalone resources https://docs.gitlab.com/ee/api/api_resources.html#standalone-resources (for example only allow register runner and not remove a runner)

Disabling web admin features will disable /admin

If I need an admin node, I could setup internal node not exposed to the world for admin tasks.