qipy run: use exec instead of subprocess.call
qipy run: use exec instead of subprocess.call

Fixes #23803

Change-Id: Iab2537776b88fc0da0dac292f2da860f8034567f

dmerejkowsky/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild,aldebaran/qibuild