Add secret storage readiness checks

This visits all places that were checking for cross-siging readiness and adapts
them to also check for secret storage readiness if needed.

Part of https://github.com/vector-im/element-web/issues/13895

src/rageshake/submit-rageshake.ts

@@ -115,6 +115,7 @@ async function collectBugReport(opts: IOpts = {}, gzipLogs = true) {
             body.append("cross_signing_supported_by_hs",
                 String(await client.doesServerSupportUnstableFeature("org.matrix.e2e_cross_signing")));
             body.append("cross_signing_ready", String(await client.isCrossSigningReady()));
+            body.append("secret_storage_ready", String(await client.isSecretStorageReady()));
         }
     }