misc: add count parameter to BaseResource.jobs() (#87168)

It limits the number of jobs to run; it is useful for tests.

passerelle/base/models.py

@@ -607,7 +607,7 @@ class BaseResource(models.Model):
         resource_type = ContentType.objects.get_for_model(self)
         return Job.objects.filter(resource_type=resource_type, resource_pk=self.pk)
 
-    def jobs(self):
+    def jobs(self, count=-1):
         # "jobs" cron job to run asynchronous tasks
         if self.down():
             # don't try running jobs if connector is known to be down.
@@ -617,6 +617,9 @@ class BaseResource(models.Model):
             skip_locked = {}
         skipped_jobs = []
         while True:
+            if count == 0:
+                break
+            count -= 1
             # optimistic skip
             if (
                 not self.jobs_set()