Auth: Replace maximum inactive/lifetime settings of days to duration (#27150)

Allows login_maximum_inactive_lifetime_duration and 
login_maximum_lifetime_duration to be configured using 
time.Duration-compatible values while retaining backward compatibility.

Fixes #17554

Co-authored-by: Marcus Efraimsson <marcus.efraimsson@gmail.com>

pkg/services/auth/auth_token_test.go

@@ -494,13 +494,14 @@ func TestUserAuthToken(t *testing.T) {
 
 func createTestContext(t *testing.T) *testContext {
 	t.Helper()
-
+	maxInactiveDurationVal, _ := time.ParseDuration("168h")
+	maxLifetimeDurationVal, _ := time.ParseDuration("720h")
 	sqlstore := sqlstore.InitTestDB(t)
 	tokenService := &UserAuthTokenService{
 		SQLStore: sqlstore,
 		Cfg: &setting.Cfg{
-			LoginMaxInactiveLifetimeDays: 7,
-			LoginMaxLifetimeDays:         30,
+			LoginMaxInactiveLifetime:     maxInactiveDurationVal,
+			LoginMaxLifetime:             maxLifetimeDurationVal,
 			TokenRotationIntervalMinutes: 10,
 		},
 		log: log.New("test-logger"),