Auto merge of #110142 - Mark-Simulacrum:reduce-core-counts, r=pietroa…

…lbini

Reduce core counts for a number of builders

Best reviewed by-commit; first commit renames all builder names to include core counts.

Applied changes for these builders (only on the auto branch, haven't touched PR CI):

- arm-android -> 8 core (currently at 39 minutes; 25.58% CPU)
- armhf-gnu -> 8 core (currently at 31 minutes; 30.97% CPU)
- dist-aarch64-linux -> 8 core (currently at 35 minutes; 55.38% CPU)
- dist-android -> 8 core (currently at 18 minutes; 43.03% CPU)
- dist-armhf-linux -> 8 core (currently at 27 minutes; 54.71% CPU)
- dist-armv7-linux -> 8 core (currently at 29 minutes; 50.33% CPU)
- dist-i586-gnu-i586-i686-musl -> 8 core (currently at 27 minutes; 48.31% CPU)
- dist-i686-linux -> 8 core (currently at 32 minutes; 52.39% CPU)
- dist-mips-linux -> 8 core (currently at 25 minutes; 55.09% CPU)
- dist-mips64-linux -> 8 core (currently at 25 minutes; 55.33% CPU)
- dist-mips64el-linux -> 8 core (currently at 26 minutes; 54.93% CPU)
- dist-mipsel-linux -> 8 core (currently at 25 minutes; 55.38% CPU)
- dist-powerpc-linux -> 8 core (currently at 26 minutes; 55.77% CPU)
- dist-powerpc64-linux -> 8 core (currently at 27 minutes; 55.03% CPU)
- dist-powerpc64le-linux -> 8 core (currently at 27 minutes; 54.95% CPU)
- dist-riscv64-linux -> 8 core (currently at 26 minutes; 54.43% CPU)
- dist-s390x-linux -> 8 core (currently at 30 minutes; 55.97% CPU)
- dist-various-1 -> 8 core (currently at 36 minutes; 29.16% CPU)
- dist-various-2 -> 8 core (currently at 27 minutes; 32.69% CPU)
- dist-x86_64-freebsd -> 8 core (currently at 27 minutes; 51.69% CPU)
- dist-x86_64-illumos -> 8 core (currently at 30 minutes; 54.88% CPU)
- dist-x86_64-musl -> 8 core (currently at 39 minutes; 57.56% CPU)
- dist-x86_64-netbsd -> 8 core (currently at 26 minutes; 55.82% CPU)
- mingw-check -> 8 core (currently at 17 minutes; 35.00% CPU)
- test-various -> 8 core (currently at 22 minutes; 44.84% CPU)
- wasm32 -> 8 core (currently at 19 minutes; 62.94% CPU)
- x86_64-gnu -> 8 core (currently at 32 minutes; 50.31% CPU)
- x86_64-gnu-stable -> 8 core (currently at 32 minutes; 51.23% CPU)
- x86_64-gnu-aux -> 8 core (currently at 22 minutes; 46.39% CPU)
- x86_64-gnu-debug -> 8 core (currently at 21 minutes; 53.93% CPU)
- x86_64-gnu-distcheck -> 8 core (currently at 38 minutes; 55.93% CPU)
- x86_64-gnu-llvm-15 -> 8 core (currently at 34 minutes; 52.99% CPU)
- x86_64-gnu-llvm-14 -> 8 core (currently at 34 minutes; 52.09% CPU)
- x86_64-gnu-llvm-14-stage1 -> 8 core (currently at 33 minutes; 51.13% CPU)
- x86_64-gnu-nopt -> 8 core (currently at 29 minutes; 53.36% CPU)
- x86_64-gnu-tools -> 8 core (currently at 22 minutes; 40.56% CPU)

We may also want to look at merging some of these builders in the future (to deduplicate stage0 builds and such) but that can happen separately - and is more work than just adjusting core counts.

r? `@pietroalbini`