Enhance build workflow for PSL1GHT samples

[bucanero]

Updated the build process to include installation and validation steps for PSL1GHT samples.

[TheMrIron2]

I agree with moving the PSL1GHT sample testing to this repository instead of PS3DEV, it is architecturally more correct.
The prototype is a good start - we'll need to decide on how to handle - or skip - Cg. Your suggestion on Discord to pre-compile the shaders for sample testing is probably a nicer solution than trying to make the runner install deprecated CgToolkit.

See if we can build each sample category separately, since the current audio graphics input network spu sys order means one graphics failure stops all later categories from being tested. Several samples do need an audit, but I don't think we should let that fact block this CI - if anything, this CI is supposed to highlight what samples need investigation.

I'll keep a smaller test in ps3dev/ps3dev instead, and extract each platform release package to compile one representative PPU sample and one SPU sample. This repository should answer "do all of these samples work under a known-good Linux environment?", whereas PS3DEV may want to answer a slightly different question - "can all platforms build working samples?"