feat: get user scim v2 endpoint (#9161)

# Which Problems Are Solved
- Adds support for the get user SCIM v2 endpoint

# How the Problems Are Solved
- Adds support for the get user SCIM v2 endpoint under `GET
/scim/v2/{orgID}/Users/{id}`

# Additional Context
Part of #8140
Replaces https://github.com/zitadel/zitadel/pull/9154 as requested by
the maintainers, discussions see
https://github.com/zitadel/zitadel/pull/9154.

internal/api/scim/authz.go

@@ -10,6 +10,9 @@ var AuthMapping = authz.MethodMapping{
 	"POST:/scim/v2/" + http.OrgIdInPathVariable + "/Users": {
 		Permission: domain.PermissionUserWrite,
 	},
+	"GET:/scim/v2/" + http.OrgIdInPathVariable + "/Users/{id}": {
+		Permission: domain.PermissionUserRead,
+	},
 	"DELETE:/scim/v2/" + http.OrgIdInPathVariable + "/Users/{id}": {
 		Permission: domain.PermissionUserDelete,
 	},