JIT

GH-141362: Make `get_externals` handle fetching platform-specific release artifacts #4532

Job	Run time
Interpreter (Debug)	10m 1s
JIT without optimizations (Debug) (21)	11m 21s
JIT with tail calling interpreter (21)	3m 17s
Free-Threaded (Debug) (21)	15m 43s
x86_64-apple-darwin/clang (Debug)	27m 41s
x86_64-pc-windows-msvc/msvc (Debug)	20m 46s
i686-pc-windows-msvc/msvc (Debug)	21m 59s
aarch64-pc-windows-msvc/msvc (Debug)	21m 43s
x86_64-unknown-linux-gnu/gcc (Release)	8m 13s
x86_64-pc-windows-msvc/msvc (Release)	12m 39s
aarch64-unknown-linux-gnu/gcc (Debug)	7m 53s
aarch64-apple-darwin/clang (Release)	9m 29s
aarch64-pc-windows-msvc/msvc (Release)	17m 49s
x86_64-apple-darwin/clang (Release)	21m 14s
i686-pc-windows-msvc/msvc (Release)	12m 47s
aarch64-unknown-linux-gnu/gcc (Release)	6m 26s
aarch64-apple-darwin/clang (Debug)	12m 46s
x86_64-unknown-linux-gnu/gcc (Debug)	11m 19s
	4h 13m 6s

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