1746245 - (webgpu-in-nightly) Enable WebGPU in Nightly by default

https://bugzilla.mozilla.org/show_bug.cgi?id=1746245

https://twitter.com/home/status/1642428908103512064

https://twitter.com/home/status/1642477559240704000

https://twitter.com/home/status/1642615896077373441