[AiAssistance] Add max length to the text input

Fixed: 369492000
Change-Id: Idc72ade6b2575cf9e84bd4288f776308a4e7f740
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6225602
Commit-Queue: Ergün Erdoğmuş <[email protected]>
Reviewed-by: Alex Rudenko <[email protected]>
Commit-Queue: Alex Rudenko <[email protected]>
Auto-Submit: Ergün Erdoğmuş <[email protected]>

Author: ergunsh

front_end/panels/ai_assistance/components/ChatView.ts

@@ -1201,6 +1201,7 @@ export class ChatView extends HTMLElement {
         <textarea class=${cls}
           .disabled=${this.#isTextInputDisabled()}
           wrap="hard"
+          maxlength="10000"
           @keydown=${this.#handleTextAreaKeyDown}
           placeholder=${this.#getInputPlaceholderString()}
           jslog=${VisualLogging.textField('query').track({ keydown: 'Enter' })}