Allow obtaining a `AnonymousViewContext` from a `ViewContext` #20452

Job	Run time
Test spacetimedb-update flow (aarch64-unknown-linux-gnu)	49s
Verify global.json files are symlinks	1m 6s
Test spacetimedb-update flow (aarch64-apple-darwin)	2m 36s
Check that packages are publishable	32s
Lints	3m 14s
Test spacetimedb-update flow (x86_64-unknown-linux-gnu)	1m 40s
Check CI command docs	1m 7s
Check smoketests/mod.rs is complete	3m 9s
Check for Python smoketest edits	10s
Test spacetimedb-update flow (x86_64-pc-windows-msvc)	5m 56s
Check CLI docs	4m 45s
Build and test wasm bindings	8m 48s
Unreal Engine Tests	-1s
Verify LLM benchmark is up to date	-1s
Smoketests (Linux)	24m 14s
csharp-testsuite	14m 7s
Smoketests (Windows)	57m 9s
Test Suite	24m 48s
unity-testsuite	0s
Internal Tests	0s
	2h 34m 8s

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