Handle errors in stream without panic

[insipx]

2025-02-01T17:23:33.243006Z DEBUG grpc_connect{address="https://grpc.dev.xmtp.network:443"}:Connection{peer=Client}: h2::codec::framed_read: received frame=Data { stream_id: StreamId(23) }
2025-02-01T17:23:33.243257Z DEBUG xmtp_mls::storage::encrypted_store::native: Pulling connection from pool, idle_connections=25, total_connections=25
2025-02-01T17:23:33.243303Z  INFO xmtp_mls::subscriptions::stream_conversations: Trying to process streamed welcome installation_id="acf05b6053643a7ec1edf76eb9a1297194d184807e2bad1b4a6d13a8a586a88a" welcome_id=346388
2025-02-01T17:23:33.243313Z DEBUG xmtp_mls::storage::encrypted_store: Transaction async beginning
2025-02-01T17:23:33.243334Z  INFO xmtp_mls::groups: Trying to decrypt welcome
2025-02-01T17:23:33.243343Z DEBUG xmtp_mls::storage::sql_key_store: read KeyPackageReferences
2025-02-01T17:23:33.244058Z DEBUG xmtp_mls::storage::sql_key_store: read KeyPackage
2025-02-01T17:23:33.244742Z DEBUG xmtp_mls::storage::sql_key_store: read KeyPackage
2025-02-01T17:23:33.254034Z DEBUG xmtp_mls::storage::sql_key_store: write Tree
2025-02-01T17:23:33.258942Z DEBUG xmtp_mls::storage::sql_key_store: write ConfirmationTag
2025-02-01T17:23:33.258995Z DEBUG xmtp_mls::storage::sql_key_store: write GroupContext
2025-02-01T17:23:33.259011Z DEBUG xmtp_mls::storage::sql_key_store: write InterimTranscriptHash
2025-02-01T17:23:33.259559Z  INFO xmtp_mls::groups: Creating from welcome
2025-02-01T17:23:33.259570Z DEBUG xmtp_mls::storage::sql_key_store: read KeyPackage
2025-02-01T17:23:33.263428Z DEBUG xmtp_mls::storage::sql_key_store: write Tree
2025-02-01T17:23:33.263479Z DEBUG xmtp_mls::storage::sql_key_store: write ConfirmationTag
2025-02-01T17:23:33.263492Z DEBUG xmtp_mls::storage::sql_key_store: write GroupContext
2025-02-01T17:23:33.263499Z DEBUG xmtp_mls::storage::sql_key_store: write InterimTranscriptHash
2025-02-01T17:23:33.263582Z DEBUG xmtp_mls::storage::sql_key_store: Writing encryption epoch key pairs
2025-02-01T17:23:33.263586Z DEBUG xmtp_mls::storage::sql_key_store: write EpochKeyPairs
2025-02-01T17:23:33.263600Z DEBUG xmtp_mls::storage::sql_key_store: write Tree
2025-02-01T17:23:33.263607Z DEBUG xmtp_mls::storage::sql_key_store: write ConfirmationTag
2025-02-01T17:23:33.263615Z DEBUG xmtp_mls::storage::sql_key_store: write GroupContext
2025-02-01T17:23:33.263621Z DEBUG xmtp_mls::storage::sql_key_store: write InterimTranscriptHash
2025-02-01T17:23:33.263628Z DEBUG xmtp_mls::storage::sql_key_store: write EpochSecrets
2025-02-01T17:23:33.263633Z DEBUG xmtp_mls::storage::sql_key_store: write OwnLeafNodeIndex
2025-02-01T17:23:33.263643Z DEBUG xmtp_mls::storage::sql_key_store: write MessageSecrets
2025-02-01T17:23:33.263648Z DEBUG xmtp_mls::storage::sql_key_store: write ResumptionPskStore
2025-02-01T17:23:33.263654Z DEBUG xmtp_mls::storage::sql_key_store: write MlsGroupJoinConfig
2025-02-01T17:23:33.263659Z DEBUG xmtp_mls::storage::sql_key_store: write GroupState
2025-02-01T17:23:33.263708Z DEBUG xmtp_mls::storage::encrypted_store: Transaction async being rolled back
2025-02-01T17:23:33.263759Z  INFO xmtp_mls::storage::encrypted_store: error is not retryable. Generic("Invalid permissions for DM group"):generic: Invalid permissions for DM group
2025-02-01T17:23:33.263765Z  INFO xmtp_mls::subscriptions::stream_conversations: Processing welcome failed, trying to load existing..
thread 'tokio-runtime-worker' panicked at /Users/runner/work/libxmtp/libxmtp/xmtp_mls/src/subscriptions/stream_conversations.rs:335:78:
`async fn` resumed after completion
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

if a stream encounters an error, it should return it to the caller rather than panicking