Add particle y-billboard option to standard shader #21963

Job	Run time
📊 Static checks / Code style, file formatting, and docs	48s
🐧 Linux / Editor w/ Mono (target=editor)	22m 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)	25m 54s
🤖 Android / Template (target=template_release)	13m 51s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	21m 35s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	20m 39s
🍏 iOS / Template (target=template_release)	14m 37s
🍎 macOS / Editor (target=editor, tests=yes)	36m 37s
🐧 Linux / Template w/ Mono (target=template_release)	10m 38s
🌐 Web / Template w/ threads (target=template_release, threads=yes)	11m 6s
🍎 macOS / Template (target=template_release)	15m 11s
🐧 Linux / Minimal template (target=template_release, everything disabled)	7m 48s
🌐 Web / Template w/o threads (target=template_release, threads=no)	11m 11s
🏁 Windows / Editor (target=editor, tests=yes)	26m 49s
🏁 Windows / Template (target=template_release)	18m 8s
🪲 Godot CPP / Build and test Godot CPP	6m 53s
	4h 24m 8s

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