refactor(crypto): Keep a long-lived DecryptionRetryTask in TimelineCo… #14420

Job	Run time
Generate Crypto FFI Apple XCFramework	5m 3s
Run Complement Crypto tests / tests	8m 26s
xtask / xtask-🐧	5s
xtask / xtask-🍏	50s
Test UniFFI bindings generation	2m 0s
matrix-rust-components-swift	10m 28s
matrix-rust-components-kotlin	5m 24s
	32m 16s

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