add mix format and dialyzer to CI · beyond-all-reason/teiserver@155aa70

test GETUSERINFO (Teiserver.SpringAuthAsyncTest)

test battle with password (Teiserver.SpringBattleHostTest)

test !rehost bug test (Teiserver.SpringBattleHostTest)

test host battle test (Teiserver.SpringBattleHostTest)

test friends (Teiserver.Coordinator.GatekeeperTest)

test friendsplay (Teiserver.Coordinator.GatekeeperTest)

test RENAMEACCOUNT (Teiserver.SpringAuthTest)

test perform task (Teiserver.Logging.Tasks.PersistServerMonthTaskTest)

test index lists all bans (TeiserverWeb.Moderation.BanControllerTest)

test index (TeiserverWeb.Report.GeneralControllerTest)

negative steps are not supported in String.slice/2, pass 0..-2//1 instead

no route path for TeiserverWeb.Router matches "/telemetry/complex_client/summary"

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