Fix missing editor singletons when dumping extension api #13432

Job	Run time
📊 Static checks / Code style, file formatting, and docs	54s
🍎 macOS / Editor (target=editor, tests=yes)	4m 32s
🍎 macOS / Template (target=template_release)	3m 11s
🌐 Web / Template (target=template_release)	1m 45s
🍏 iOS / Template (target=template_release)	2m 39s
🏁 Windows / Editor (target=editor, tests=yes)	8m 3s
🤖 Android / Template (target=template_release)	5m 5s
🏁 Windows / Template (target=template_release)	10m 13s
🐧 Linux / Editor w/ Mono (target=editor)	3m 52s
🐧 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)	15m 6s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	8m 8s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	10m 24s
🐧 Linux / Template w/ Mono (target=template_release)	2m 2s
🐧 Linux / Minimal template (target=template_release, everything disabled)	1m 3s
🪲 Godot CPP / Build and test Godot CPP	12m 52s
	1h 29m 49s

Provide feedback