gh-149196: Hide executor implementation details from ABI tools #3427

Job	Run time
x86_64-unknown-linux-gnu/gcc-free-threading	7m 35s
aarch64-unknown-linux-gnu/gcc	6m 28s
x86_64-apple-darwin/clang	18m 56s
x86_64-unknown-linux-gnu/gcc	10m 55s
aarch64-apple-darwin/clang	14m 20s
	58m 14s

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