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/user_test.go

@@ -357,8 +357,8 @@ func TestListStopWatches(t *testing.T) {
 }
 
 func TestUserLocationMapLink(t *testing.T) {
-	setting.Service.UserLocationMapURL = "https://example/foo/"
 	defer tests.PrepareTestEnv(t)()
+	defer test.MockVariableValue(&setting.Service.UserLocationMapURL, "https://example/foo/")()
 
 	session := loginUser(t, "user2")
 	req := NewRequestWithValues(t, "POST", "/user/settings", map[string]string{