Build Mono LLVM legs on the CBL-Mariner images, but run the AOTing steps on CentOS Stream 8 with binutils #85273
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We want to move off of using CentOS 7 images for our builds, but Mono's AOT tooling uses binutils tools for its AOT process. We can't built Mono on CentOS Stream 8 images as that introduces too high of a glibc dependency. This PR moves the product build steps to use our CBL-Mariner images that set up the right libc dependency, while setting up the AOT legs to use our CentOS Stream 8 image that provides the binutils tools on a supported base image.
Replaces #84727