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/timetracking_test.go

@@ -7,7 +7,6 @@ import (
 	"net/http"
 	"path"
 	"testing"
-	"time"
 
 	"forgejo.org/modules/test"
 	"forgejo.org/tests"
@@ -60,9 +59,6 @@ func testViewTimetrackingControls(t *testing.T, session *TestSession, user, repo
 		htmlDoc.AssertElement(t, ".timetrack .issue-stop-time", true)
 		htmlDoc.AssertElement(t, ".timetrack .issue-cancel-time", true)
 
-		// Sleep for 1 second to not get wrong order for stopping timer
-		time.Sleep(time.Second)
-
 		req = NewRequestWithValues(t, "POST", path.Join(user, repo, "issues", issue, "times", "stopwatch", "toggle"), map[string]string{
 			"_csrf": htmlDoc.GetCSRF(),
 		})