Rollup merge of #121278 - Nilstrieb:no-more-codegen, r=clubby789

Remove the "codegen" profile from bootstrap

This profile originally made sense when download-ci-llvm = if-unchanged didn't exist and we had the bad tradeoff of "never modify or always compile".

Thankfully, these grim times are over and we have discovered clean water, so the only differentiator between the two profiles is the codegen profile having LLVM assertions. Adding them doesn't cause that much of a slowdown, <10% on UI tests from an unscientific benchmark.

It also had LLVM warnings when compiling, which makes sense for every compiler contributor brave enough to compile LLVM.

The way I removed is by just issueing a nice error message. Given that everyone with this profile should be a contributor and not someone like a distro who is more upset when things break, this should be fine. If it isn't, we can always fall back to just letting codegen mean compiler.

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