Add TestbedEventFreezeUser & TestbedEventUpdateOrganization events to the testbed #20655

Job	Run time
dispatch	7s
📊 Q&A	1m 9s
spelling / cspell	20s
docs	0s
python / (🐧 Linux only): 🐍 Python server tests	3m 25s
web / 🌐 Web tests	15m 50s
rust / 🍎 macOS: 🦀 Rust tests	1m 36s
rust / 🐧 Linux: 🦀 Rust tests	2m 36s
rust / 🏁 Windows: 🦀 Rust tests	6m 7s
⭐ CI is happy ⭐	3s
	31m 13s

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