Confirmed that if I install cheese and run:
sudo cheese -d "Intel MIPI Camera"
on my Dell Inc. XPS 9315, a camera feed comes up (like when I run the gst 
command, the quality is awful, like it has some kind of vintage filter applied, 
but I believe that is expected).

Ran:
sudo apt install v4l2loopback-dkms
sudo modprobe v4l2loopback exclusive_caps=1


What did you mean by "Ensure the virtual camera device (/dev/video0) is 
available"?

When I run your gst-launch command, it fails:
$ gst-launch-1.0 libcamerasrc ! videoconvert ! 
video/x-raw,format=YUY2,width=1024,height=768,framerate=30/1 ! v4l2sink 
device=/dev/video0
Setting pipeline to PAUSED ...
ERROR: from element /GstPipeline:pipeline0/GstV4l2Sink:v4l2sink0: Device 
'/dev/video0' is not a output device.
Additional debug info:
../sys/v4l2/v4l2_calls.c(641): gst_v4l2_open (): 
/GstPipeline:pipeline0/GstV4l2Sink:v4l2sink0:
Capabilities: 0x24a00001
ERROR: pipeline doesn't want to preroll.
Failed to set pipeline to PAUSED.
Setting pipeline to NULL ...
Freeing pipeline ...

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https://bugs.launchpad.net/bugs/2107304

Title:
  Intel MIPI Camera not working out of the box on 25.04 where it did on
  24.10

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