switch CI jobs between windows and linux for example execution

[mockersf]

Objective

• Example execution on linux/vulkan on CI is segfaulting for unclear reasons
• This makes a lot of noise on PRs

Solution

• Switch example execution on Linux to validation jobs (on PR merged). It will still crash but not block merging, and we'll know when it's fixed
• Switch example execution on Windows to CI jobs (on PR push). It's a bit longer than on Linux but provides a useful status
• Disable job commenting on PR with job execution to reduce noise

[alice-i-cecile]

I'm on board with the swap, but I'd prefer not to have commented out code. That's what version control is for! Don't block on this though.

[cart]

This does seem to increase the run time of the job pretty significantly. The first run finished in 26 minutes, vs the 11-15 minutes on linux. If its 26 minutes every time, it will add an extra 10-ish minutes to every build (which used to take 15 ish minutes with the linux variant).

I trigger a second run for another datapoint.

[cart]

Second run was 15 minutes. Nice!

[cart]

Also on board, but I agree that we should just remove the commented out section