chore: QoL improvements to tests (#7917)

- Use mock helper functions, instead of home-brew solutions.
- Disable cron jobs that are not important to be run during integration tests and might even interfere.
- Avoid sleeping unnecessary, if there's some requirement then sleep or retry until that requirement is met.
- Avoid trying to deliver webhooks that will always result in a failure.

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/7917
Reviewed-by: Michael Kriese <michael.kriese@gmx.de>
Co-authored-by: Gusted <postmaster@gusted.xyz>
Co-committed-by: Gusted <postmaster@gusted.xyz>

tests/integration/setting_test.go

@@ -13,6 +13,7 @@ import (
 	"forgejo.org/models/unittest"
 	user_model "forgejo.org/models/user"
 	"forgejo.org/modules/setting"
+	"forgejo.org/modules/test"
 	"forgejo.org/tests"
 
 	"github.com/stretchr/testify/assert"
@@ -98,8 +99,7 @@ func TestSettingShowUserEmailProfile(t *testing.T) {
 
 func TestSettingLandingPage(t *testing.T) {
 	defer tests.PrepareTestEnv(t)()
-
-	landingPage := setting.LandingPageURL
+	defer test.MockProtect(&setting.LandingPageURL)()
 
 	setting.LandingPageURL = setting.LandingPageHome
 	req := NewRequest(t, "GET", "/")
@@ -119,8 +119,6 @@ func TestSettingLandingPage(t *testing.T) {
 	req = NewRequest(t, "GET", "/")
 	resp = MakeRequest(t, req, http.StatusSeeOther)
 	assert.Equal(t, "/user/login", resp.Header().Get("Location"))
-
-	setting.LandingPageURL = landingPage
 }
 
 func TestSettingSecurityAuthSource(t *testing.T) {