user service: add oauth and profile images (#17784)

* users: add cache to service

* reflect review comments

* add oauth

* move profile picture genaration

* reflect review comments

* move default bot image to users package

* add missing wraps and apply suggestions

* add comment for app.GetSession

app/session_test.go

@@ -329,58 +329,6 @@ func TestApp_ExtendExpiryIfNeeded(t *testing.T) {
 	}
 }
 
-const (
-	dayInMillis = 86400000
-	grace       = 5 * 1000
-	thirtyDays  = dayInMillis * 30
-)
-
-func TestApp_SetSessionExpireInDays(t *testing.T) {
-	th := Setup(t)
-	defer th.TearDown()
-
-	now := model.GetMillis()
-	createAt := now - (dayInMillis * 20)
-
-	tests := []struct {
-		name   string
-		extend bool
-		create bool
-		days   int
-		want   int64
-	}{
-		{name: "zero days, extend", extend: true, create: true, days: 0, want: now},
-		{name: "zero days, extend", extend: true, create: false, days: 0, want: now},
-		{name: "zero days, no extend", extend: false, create: true, days: 0, want: createAt},
-		{name: "zero days, no extend", extend: false, create: false, days: 0, want: now},
-		{name: "thirty days, extend", extend: true, create: true, days: 30, want: now + thirtyDays},
-		{name: "thirty days, extend", extend: true, create: false, days: 30, want: now + thirtyDays},
-		{name: "thirty days, no extend", extend: false, create: true, days: 30, want: createAt + thirtyDays},
-		{name: "thirty days, no extend", extend: false, create: false, days: 30, want: now + thirtyDays},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			th.App.UpdateConfig(func(cfg *model.Config) {
-				*cfg.ServiceSettings.ExtendSessionLengthWithActivity = tt.extend
-			})
-			var create int64
-			if tt.create {
-				create = createAt
-			}
-
-			session := &model.Session{
-				CreateAt:  create,
-				ExpiresAt: model.GetMillis() + dayInMillis,
-			}
-			th.App.SetSessionExpireInDays(session, tt.days)
-
-			// must be within 5 seconds of expected time.
-			require.GreaterOrEqual(t, session.ExpiresAt, tt.want-grace)
-			require.LessOrEqual(t, session.ExpiresAt, tt.want+grace)
-		})
-	}
-}
-
 func TestGetCloudSession(t *testing.T) {
 	th := Setup(t)
 	defer func() {