Refactor and fix `make_virtuals.py` #17006

Job	Run time
📊 Static checks / Code style, file formatting, and docs	53s
🍏 iOS / Template (target=template_release)	15m 25s
🍎 macOS / Editor (target=editor, tests=yes)	27m 57s
🍎 macOS / Template (target=template_release)	24m 39s
🌐 Web / Template (target=template_release)	14m 15s
🤖 Android / Template (target=template_release)	22m 40s
🐧 Linux / Editor w/ Mono (target=editor)	27m 57s
🐧 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)	28m 9s
🏁 Windows / Editor (target=editor, tests=yes)	33m 53s
🏁 Windows / Template (target=template_release)	22m 35s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	27m 11s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	23m 55s
🐧 Linux / Template w/ Mono (target=template_release)	16m 46s
🐧 Linux / Minimal template (target=template_release, everything disabled)	12m 45s
🪲 Godot CPP / Build and test Godot CPP	7m 0s
	5h 6m 0s

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