Disable Ecto query logging in tests

The debug logs are very noisy and can be enabled during analysis
of a specific error believed to be SQL-related

--

Before log capturing those debug messages were still hidden,
but with log capturing they show up in the output of failed
tests unless disabled.

Cherry-picked-from: e628d00a81

config/test.exs

@@ -51,7 +51,8 @@
   hostname: System.get_env("DB_HOST") || "localhost",
   pool: Ecto.Adapters.SQL.Sandbox,
   pool_size: 50,
-  queue_target: 5000
+  queue_target: 5000,
+  log: false
 
 config :pleroma, :dangerzone, override_repo_pool_size: true