Add `tests/python_build` to clang-format pre-commit hook ignore list #19302

Job	Run time
📊 Static checks / Code style, file formatting, and docs	36s
🤖 Android / Template (target=template_release)	4m 9s
🍏 iOS / Template (target=template_release)	3m 1s
🍎 macOS / Editor (target=editor, tests=yes)	7m 41s
🍎 macOS / Template (target=template_release)	4m 24s
🏁 Windows / Editor (target=editor, tests=yes)	8m 54s
🏁 Windows / Template (target=template_release)	7m 26s
🌐 Web / Template (target=template_release)	1m 35s
🐧 Linux / Editor w/ Mono (target=editor)	5m 44s
🐧 Linux / Editor with doubles and GCC sanitizers (target=editor, tests=yes, dev_build=yes, scu_build=yes, precision=double, use_asan=yes, use_ubsan=yes, linker=gold)	17m 55s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	6m 27s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	7m 45s
🐧 Linux / Template w/ Mono (target=template_release)	2m 20s
🐧 Linux / Minimal template (target=template_release, everything disabled)	1m 14s
🪲 Godot CPP / Build and test Godot CPP	6m 46s
	1h 25m 57s

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