Rollup merge of #132891 - Zalathar:short-opt-groups, r=jieyouxu

Remove `rustc_session::config::rustc_short_optgroups`

Follow-up to https://github.com/rust-lang/rust/pull/132754#discussion_r1835427349.

The name `rustc_short_optgroups` has always been confusing, because it is unrelated to the distinction between short and long options (i.e. `-s` vs `--long`), and instead means something like “the subset of command-line options that are printed by `rustc --help` without `-v`”.

So let's merge that function into the main `rustc_optgroups`, and store the relevant bit of information in a boolean field in `RustcOptGroup` instead.

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This PR also modifies `RustcOptGroup` to store its various strings directly, instead of inside a boxed `apply` closure. That turned out to not be necessary for the main change, but is a worthwhile cleanup in its own right.

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