Merge branch 'default-mrf' into 'develop'

Add TagPolicy as default MRF

See merge request pleroma/pleroma!2834

config/config.exs

@@ -820,7 +820,7 @@ config :pleroma, :restrict_unauthenticated,
 config :pleroma, Pleroma.Web.ApiSpec.CastAndValidate, strict: false
 
 config :pleroma, :mrf,
-  policies: Pleroma.Web.ActivityPub.MRF.ObjectAgePolicy,
+  policies: [Pleroma.Web.ActivityPub.MRF.ObjectAgePolicy, Pleroma.Web.ActivityPub.MRF.TagPolicy],
   transparency: true,
   transparency_exclusions: []