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/release_test.go

@@ -9,7 +9,6 @@ import (
 	"net/http"
 	"strconv"
 	"testing"
-	"time"
 
 	auth_model "forgejo.org/models/auth"
 	"forgejo.org/models/db"
@@ -85,9 +84,6 @@ func TestViewReleases(t *testing.T) {
 	session := loginUser(t, "user2")
 	req := NewRequest(t, "GET", "/user2/repo1/releases")
 	session.MakeRequest(t, req, http.StatusOK)
-
-	// if CI is too slow this test fail, so lets wait a bit
-	time.Sleep(time.Millisecond * 100)
 }
 
 func TestViewReleasesNoLogin(t *testing.T) {