Web support from `libparsec_platform_async` #20841

Job	Run time
dispatch	8s
📊 Q&A	1m 13s
spelling / cspell	19s
docs	0s
web / 🌐 Web tests	12m 41s
python / (🐧 Linux only): 🐍 Python server tests	3m 50s
rust / 🍎 macOS: 🦀 Rust tests	1m 32s
rust / 🐧 Linux: 🦀 Rust tests	7m 45s
rust / 🏁 Windows: 🦀 Rust tests	6m 31s
⭐ CI is happy ⭐	1s
	34m 0s

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