If permissionsV2 feature flag is toggled, we should recompute the
permissions.
We decided to make each WorkspaceXxCacheService Xx-specific (feature
flag, permissions...), so we are not recomputing permission cache from
workspaceFeatureFlagCacheService where feature flags are recomputed,
even if that would be a lower level than FeatureFlagService. This allows
to avoid complex circuclar dependency and keeps a clear purpose for each
service.
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