Pulse visualization sometimes omits channels

[wshanks]

Environment

• Qiskit Terra version: 0.22.0
• Python version: 3.10
• Operating system: Linux

What is happening?

Sometimes the draw() on a pulse schedule produces a visualization with missing channels.

How can we reproduce the issue?

For the environment given above, this can be reproduced with:

from qiskit import pulse
from qiskit.providers.fake_provider import FakeMumbai

backend = FakeMumbai()

amp = 0.06
duration_dt = 224
with pulse.build(backend=backend) as sched:
    drive_pulse = pulse.Constant(duration_dt, amp)
    pulse.play(drive_pulse, pulse.DriveChannel(2))
    pulse.play(drive_pulse, pulse.DriveChannel(25))
sched.draw()

It depends on a Python set iteration order, so the behavior might vary across environments.

What should happen?

All channels should be displayed in the visualization.

Any suggestions?

See #8974

[mtreinish]

Fixed by #8974