fix(config-utilities): detect native-comp with the right predicate, clear eln-cache

cj/recompile-emacs-home selected native compilation with (boundp 'native-compile-async), but that's a function, so boundp is always nil. The command silently byte-compiled every time, even on native-comp builds. Detection now goes through cj/--native-comp-p, which uses native-comp-available-p. The native cleanup also deleted <dir>/eln, but the real cache is eln-cache/, so a stale cache survived. Both are pinned by tests: a regression on the detection helper, and the cache test now targets eln-cache.

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