refactor(sdk,ui): Remove `RoomEventCacheUpdate::AddTimelineItems` #13443

Job	Run time
Generate Crypto FFI Apple XCFramework	8m 35s
Run Complement Crypto tests / tests	8m 4s
xtask / xtask-🐧	8s
xtask / xtask-🍏	12s
Test UniFFI bindings generation	1m 48s
matrix-rust-components-swift	11m 38s
matrix-rust-components-kotlin	5m 33s
	35m 58s

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