Remove gold config option and use lld on Linux (#30100)

There are a few motivations for this change:

 1. lld is demonstrably faster than gold, but is really only stable on
    Linux at the moment. There's a good chance that it will be ready for
    all platforms soon though.
 2. Most people do not have gold installed on MacOS and Windows. You'd
    have to do this manually through homebrew. I think it's a safe
    assumption that this probably won't be slowing things down much on
    those platforms.
 3. We need to remove all configuration of the build that happens while
    running `./mach build` if we ever hope to make `cargo build`
    equivalent to the mach build. This unlocks static configuration of
    the rustflags. One of the big blockers for proper `cargo build`
    support.

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