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>

modules/setting/git_test.go

@@ -6,17 +6,15 @@ package setting
 import (
 	"testing"
 
+	"forgejo.org/modules/test"
+
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
 
 func TestGitConfig(t *testing.T) {
-	oldGit := Git
-	oldGitConfig := GitConfig
-	defer func() {
-		Git = oldGit
-		GitConfig = oldGitConfig
-	}()
+	defer test.MockProtect(&Git)()
+	defer test.MockProtect(&GitConfig)()
 
 	cfg, err := NewConfigProviderFromData(`
 [git.config]
@@ -37,12 +35,8 @@ diff.algorithm = other
 }
 
 func TestGitReflog(t *testing.T) {
-	oldGit := Git
-	oldGitConfig := GitConfig
-	defer func() {
-		Git = oldGit
-		GitConfig = oldGitConfig
-	}()
+	defer test.MockProtect(&Git)()
+	defer test.MockProtect(&GitConfig)()
 
 	// default reflog config without legacy options
 	cfg, err := NewConfigProviderFromData(``)