GH-145667: Merge `GET_ITER` and `GET_YIELD_FROM_ITER` #2443

Job	Run time
aarch64-unknown-linux-gnu/gcc	7m 31s
x86_64-pc-windows-msvc/msvc-free-threading	4m 58s
x86_64-unknown-linux-gnu/gcc	9m 51s
x86_64-unknown-linux-gnu/gcc-free-threading	8m 51s
x86_64-pc-windows-msvc/msvc	9m 42s
x86_64-apple-darwin/clang	19m 4s
aarch64-apple-darwin/clang	9m 28s
	1h 9m 25s

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