sdk-ui: Add `TimelineFocus::PinnedEvents` #10751

Job	Run time
Generate Crypto FFI Apple XCFramework	10m 40s
xtask / xtask-🐧	8s
xtask / xtask-🍏	7s
Run Complement Crypto tests / tests	10m 3s
matrix-rust-components-kotlin	6m 0s
Test UniFFI bindings generation	3m 11s
matrix-rust-components-swift	10m 56s
	41m 5s

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