[build-script] Use a builder to setup pass pipelines that are then scheduled when using --infer #38886
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The key thing here is that by using this builder, I am going to be able to split
the build-script-impl pipeline in two and put in a build-script pipeline in
between. This is needed so that on Linux, we can build the stage 2 compiler
before we build any of the build-script-impl libraries that depend on having a
swift compiler.
This should be an NFCI change. I am relying on our build system unit tests to
ensure that I am not changing any real behavior.