Fix WASM tests (138/151)

[insipx]

Tests in need of fixing

• xmtp_mls::storage::encrypted_store::group::tests::test_installations_last_checked_is_updated (passes on its own)
• xmtp_mls::storage::encrypted_store::group::tests::test_find_groups (passes on its own)
• xmtp_mls::groups::tests::process_messages_abort_on_retryable_error - wasm backend needs better error handling (behavior is correct but matching on msg strings and webassembly backend errors are not the same)
• xmtp_mls::groups::tests::test_add_missing_installations
• xmtp_mls::groups::tests::test_key_update (WASM Alloc Error, higher prio)
• xmtp_mls::storage::encrypted_store::group_message::tests::it_cannot_insert_message_without_group Error message discrepancy

Inter-related failing subscribe/stream tests

• xmtp_mls::subscriptions::tests::test_self_group_creation
• xmtp_mls::subscriptions::tests::test_stream_all_messages_changing_group_list
• xmtp_mls::subscriptions::tests::test_stream_all_messages_unchanging_group_list
• xmtp_mls::subscriptions::tests::test_stream_messages
• xmtp_mls::subscriptions::tests::test_stream_welcomes
• xmtp_mls::groups::subscriptions::tests::test_subscribe_membership_changes
• xmtp_mls::groups::subscriptions::tests::test_subscribe_multiple
• xmtp_mls::groups::subscriptions::tests::test_subscribe_messages

anything passing on its own but not while other tests are running is a concurrency issue related to the with_connection closure, which creates and passes an ephemeral db as a test harness. Ephemeral dbs are probably treated differently in OPFS causing these tests to fail when the in-memory db is opened by other tests.
closes #941

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[insipx]

merging this because tests outside of streaming tests are good to go, and the wasm-backend can be split into its own repository