gh-146092: Fix error handling in _BINARY_OP_ADD_UNICODE opcode (#146117) #2419

Job	Run time
x86_64-pc-windows-msvc/msvc-free-threading	4m 40s
x86_64-unknown-linux-gnu/gcc	10m 10s
x86_64-pc-windows-msvc/msvc	10m 52s
x86_64-apple-darwin/clang	18m 59s
aarch64-apple-darwin/clang	9m 33s
x86_64-unknown-linux-gnu/gcc-free-threading	8m 42s
aarch64-unknown-linux-gnu/gcc	7m 24s
	1h 10m 20s

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