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/api_repo_lfs_test.go

@@ -21,6 +21,7 @@ import (
 	"forgejo.org/modules/json"
 	"forgejo.org/modules/lfs"
 	"forgejo.org/modules/setting"
+	"forgejo.org/modules/test"
 	"forgejo.org/tests"
 
 	"github.com/stretchr/testify/assert"
@@ -228,9 +229,7 @@ func TestAPILFSBatch(t *testing.T) {
 
 		t.Run("FileTooBig", func(t *testing.T) {
 			defer tests.PrintCurrentTest(t)()
-
-			oldMaxFileSize := setting.LFS.MaxFileSize
-			setting.LFS.MaxFileSize = 2
+			defer test.MockVariableValue(&setting.LFS.MaxFileSize, 2)()
 
 			req := newRequest(t, &lfs.BatchRequest{
 				Operation: "upload",
@@ -245,8 +244,6 @@ func TestAPILFSBatch(t *testing.T) {
 			assert.NotNil(t, br.Objects[0].Error)
 			assert.Equal(t, http.StatusUnprocessableEntity, br.Objects[0].Error.Code)
 			assert.Equal(t, "Size must be less than or equal to 2", br.Objects[0].Error.Message)
-
-			setting.LFS.MaxFileSize = oldMaxFileSize
 		})
 
 		t.Run("AddMeta", func(t *testing.T) {