JIT

gh-75229: limit ensurepip prefix overrides to explicit requests #54

Job	Run time
Free-Threaded (Debug)	3m 23s
x86_64-apple-darwin/clang (Release)	39m 8s
aarch64-apple-darwin/clang (Debug)	15m 40s
x86_64-apple-darwin/clang (Debug)	35m 16s
aarch64-apple-darwin/clang (Release)	15m 39s
Interpreter (Debug)	12m 27s
JIT without optimizations (Debug)	3m 3s
aarch64-unknown-linux-gnu/gcc (Debug)	9m 7s
x86_64-pc-windows-msvc/msvc (Debug)	28m 51s
aarch64-unknown-linux-gnu/gcc (Release)	7m 0s
x86_64-pc-windows-msvc/msvc (Release)	15m 56s
x86_64-unknown-linux-gnu/gcc (Debug)	13m 26s
JIT with tail calling interpreter	4m 52s
aarch64-pc-windows-msvc/msvc (Release)	17m 55s
aarch64-pc-windows-msvc/msvc (Debug)	24m 56s
i686-pc-windows-msvc/msvc (Release)	14m 39s
i686-pc-windows-msvc/msvc (Debug)	29m 59s
x86_64-unknown-linux-gnu/gcc (Release)	7m 18s
	4h 58m 35s

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