GitLab Chat - More renames

What does this MR do and why?

• Fixes missed rename in the GitLab Chat error message
• Remove the word "the" from "Ask the GitLab Chat" per !118682 (comment 1369826798)

Screenshots or screen recordings

	Help Menu	Error Message
Before
After

How to set up and validate locally

• Ensure you are on GitLab Ultimate with a valid license
• Enable Feature Flags: Feature.enable(:openai_experimentation) and Feature.enable(:tanuki_bot)

1. Ensure the New navigation is enabled. You can enable it by clicking your User profile photo in the top right and toggle the switch
2. Click the help link in the bottom left of the new Sidebar navigation
3. Click Ask GitLab Chat link
4. Ensure drawer slides out, type anything and it should error, ensure error references GitLab Chat

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.