Fix/camera init

[krrishj18]

I found the issue causing the drone to act stuck. It was cause the drone camera was being launched in mono and not stereo so droan_gl was failing. I did 15 multi-agent runs and none of them failed vs previously when testing for raven-multi i had over 50% failure rate.

In this file below which part of isaac-sim it'll default to mono if it doesn't get info from both right and left camera
/isaac-sim/exts/isaacsim.ros2.bridge/isaacsim/ros2/bridge/ogn/python/nodes/OgnROS2CameraInfoHelper.py

is_stereo = False # ← set: default mono
if not db.inputs.renderProductPath: # left retry-guard
db.per_instance_state.initialized = False
return False
if db.inputs.renderProductPathRight: # ← set: flips True IF right input is populated
is_stereo = True
...
if is_stereo: # ← used: gate for the whole right-eye branch
camera_info_right, camera_right = read_camera_info(db.inputs.renderProductPathRight)
... stereoRectify ...
add_camera_info_writer(... topicNameRight ...) # right writer only created here
add_camera_info_writer(... topicName ...) # left writer always created

in simulation/isaac-sim/extensions/PegasusSimulator/extensions/pegasus.simulator/pegasus/simulator/ogn/api/spawn_zed_camera.py
The current line
(f"{nodes['playback']}.outputs:tick", f"{nodes['info_helper']}.inputs:execIn"),

  - SOURCE = playback.outputs:tick — the OnPlaybackTick node's tick output, which fires once every simulation frame while the sim is playing.
  - DESTINATION = info_helper.inputs:execIn — the camera-info-helper's "run now" trigger.
  The problem: the two IsaacCreateRenderProduct nodes are wired to that same playback.tick (lines 222–223), so all three are triggered by one pulse
  with no guaranteed order between them:

  playback.tick ──┬──► left_create_rp.execIn     (builds LEFT render product)
                  ├──► right_create_rp.execIn     (builds RIGHT render product)
                  └──► info_helper.execIn          (reads both — but can run before RIGHT is ready)

  On the tick where the info-helper commits its one-time init, the right render product often isn't produced yet → db.inputs.renderProductPathRight is
  empty → is_stereo = False → right writer never created.

  The new line
(f"{right_nodes['create_rp']}.outputs:execOut", f"{nodes['info_helper']}.inputs:execIn"),

  - SOURCE = right_create_rp.outputs:execOut — a node's execOut fires after that node's compute() finishes. So this pulse fires only after the right
  render product has been created and its renderProductPath output is populated.
  - DESTINATION = same info_helper.inputs:execIn.
  playback.tick ──┬──► left_create_rp.execIn
                  └──► right_create_rp.execIn ──(execOut)──► info_helper.execIn
                                                              (now runs AFTER right product exists)

  Now when compute() reads db.inputs.renderProductPathRight, it's already valid → the Isaac node's own if db.inputs.renderProductPathRight: is_stereo =
  True evaluates True → right writer is built.