🧹fix: Handle Abort Message Edge Cases (#1462)

* chore: bump langchain to v0.0.213 from v0.0.186

* fix: handle abort edge cases:
- abort message server-side if response experienced error mid-generation
- attempt to recover message if aborting resulted in error
- if abortKey is not provided, use conversationId if it exists
- if headers were already sent, send an Event stream message
- issue warning for possible Google censor/filter

refactor(streamResponse): for `sendError`, allow passing overrides so that error can include partial generation, improve typing for `sendMessage`

* chore(MessageContent): remove eslint warning for unused `i`, rephrase unfinished message text

* fix(useSSE): avoid invoking cancelHandler if the abort response was 404

* chore(TMessage): remove unnecessary, unused legacy message property `submitting`

* chore(TMessage): remove unnecessary legacy message property `cancelled`

* chore(abortMiddleware): remove unused `errorText` property to avoid confusion

api/server/routes/ask/bingAI.js

@@ -125,7 +125,6 @@ const ask = async ({
           model,
           text: text,
           unfinished: true,
-          cancelled: false,
           error: false,
           isCreatedByUser: false,
           user,
@@ -193,7 +192,6 @@ const ask = async ({
         response.details.suggestedResponses &&
         response.details.suggestedResponses.map((s) => s.text),
       unfinished,
-      cancelled: false,
       error: false,
       isCreatedByUser: false,
     };
@@ -263,7 +261,6 @@ const ask = async ({
         text: partialText,
         model,
         unfinished: true,
-        cancelled: false,
         error: false,
         isCreatedByUser: false,
       };
@@ -285,7 +282,6 @@ const ask = async ({
         conversationId,
         parentMessageId: overrideParentMessageId || userMessageId,
         unfinished: false,
-        cancelled: false,
         error: true,
         text: error.message,
         model,