Disconnect `EditorNode` from file dialogs on destruction #14817

Job	Run time
📊 Static checks / Code style, file formatting, and docs	52s
🍏 iOS / Template (target=template_release)	2m 57s
🍎 macOS / Editor (target=editor, tests=yes)	4m 19s
🍎 macOS / Template (target=template_release)	3m 37s
🤖 Android / Template (target=template_release)	44m 30s
🌐 Web / Template (target=template_release)	3m 32s
🐧 Linux / Editor w/ Mono (target=editor)	5m 57s
🏁 Windows / Editor (target=editor, tests=yes)	13m 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)	16m 55s
🏁 Windows / Template (target=template_release)	9m 24s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	10m 3s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	11m 33s
🐧 Linux / Template w/ Mono (target=template_release)	2m 11s
🐧 Linux / Minimal template (target=template_release, everything disabled)	1m 32s
🪲 Godot CPP / Build and test Godot CPP	6m 46s
	2h 17m 52s

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