Add compatibility rename of `(v)align` properties of `Label` #14760

Job	Run time
📊 Static checks / Code style, file formatting, and docs	39s
🍎 macOS / Editor (target=editor, tests=yes)	10m 6s
🍎 macOS / Template (target=template_release)	3m 19s
🍏 iOS / Template (target=template_release)	3m 20s
🤖 Android / Template (target=template_release)	8m 6s
🐧 Linux / Editor w/ Mono (target=editor)	17m 41s
🌐 Web / Template (target=template_release)	2m 30s
🏁 Windows / Editor (target=editor, tests=yes)	24m 23s
🐧 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)	32m 47s
🏁 Windows / Template (target=template_release)	11m 34s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	15m 58s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	15m 8s
🐧 Linux / Template w/ Mono (target=template_release)	2m 54s
🐧 Linux / Minimal template (target=template_release, everything disabled)	2m 3s
🪲 Godot CPP / Build and test Godot CPP	14m 13s
	2h 44m 41s

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