Revert "[MP] Handle cleanup of "scene cache" nodes" #6

Job	Run time
📊 Static checks / Code style, file formatting, and docs	3m 3s
🍏 iOS / Template (target=template_release)	8m 39s
🍎 macOS / Editor (target=editor, tests=yes)	24m 36s
🐧 Linux / Editor w/ Mono (target=editor)	33m 1s
🤖 Android / Template (target=template_release)	27m 41s
🐧 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)	34m 42s
🍎 macOS / Template (target=template_release)	16m 33s
🌐 Web / Template (target=template_release)	20m 50s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	30m 6s
🏁 Windows / Editor (target=editor, tests=yes)	42m 58s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	26m 24s
🏁 Windows / Template (target=template_release)	29m 44s
🐧 Linux / Template w/ Mono (target=template_release)	24m 14s
🐧 Linux / Minimal template (target=template_release, everything disabled)	14m 27s
🪲 Godot CPP / Build and test Godot CPP	7m 12s
	5h 44m 10s

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