First batch: remove deprecated calls on `MatrixClient` (#28207)
* Remove `initCrypto` mocking
* Remove `MatrixClient.downloadKeys` mocking
* Remove `MatrixClient.getStoredDevice` mocking
* Replace `MatrixClient.setGlobalBlacklistUnverifiedDevices` by `MatrixClient.CryptoApi.globalBlacklistUnverifiedDevices`
* Remove `MatrixClient.getStoredCrossSigningForUser` mocking
* Replace `MatrixClient.legacyDeviceVerification` by `MatrixClient.CryptoApi.requestDeviceVerification`
* Remove `MatrixClient.isCrossSigningReady` mock
* Replace `MatrixClient.bootstrapCrossSigning` by `MatrixClient.getCrypto.bootstrapCrossSigning`
* Replace `MatrixClient.getCryptoTrustCrossSignedDevices` by `MatrixClient.getCrypto.getTrustCrossSignedDevices`
* Replace `MatrixClient.hasSecretStorageKey` by `MatrixClient.SecretStorage.hasKey`
* Replace `MatrixClient.getDefaultSecretStorageKeyId` by `MatrixClient.SecretStorage.getDefaultKeyId`
* Remove `MatrixClient.encryptAndSendToDevices` call
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