tests: add unit tests for the `CryptoStoreLock` #7666

Job	Run time
Check Formatting	22s
Integration test	4m 15s
Sliding Sync Integration test	6m 13s
🐧 all crates, 🦀 stable	10m 34s
🐧 all crates, 🦀 beta	9m 6s
🍏 all crates, 🦀 stable	18m 42s
Spell Check with Typos	8s
xtask / xtask-🐧	8s
xtask / xtask-🍏	11s
🐧 [m]-examples	2m 20s
🐧 [m]-crypto	9m 3s
🐧 [m], no-encryption	3m 0s
🐧 [m], no-sqlite	5m 46s
🐧 [m], no-encryption-and-sqlite	2m 55s
🐧 [m], sqlite-cryptostore	3m 30s
🐧 [m], rustls-tls	3m 34s
🐧 [m], markdown	4m 38s
🐧 [m], socks	4m 16s
🐧 [m], sso-login	4m 23s
Run clippy	6m 50s
🐧 [m]-appservice	3m 23s
🍏 [m]-appservice	7m 9s
🕸️ [m]-qrcode	1m 42s
🕸️ [m]-base	2m 19s
🕸️ [m]-common	3m 0s
🕸️ [m]-indexeddb, no crypto	3m 54s
🕸️ [m]-indexeddb, with crypto	3m 34s
🕸️ [m], no-default, wasm-flags	3m 28s
🕸️ [m], indexeddb stores	3m 31s
🕸️ [m], indexeddb stores, no crypto	2m 18s
🕸️ [m], wasm-example	2m 32s
	2h 16m 44s

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