UI updates- summarize comments and description

What does this MR do and why?

UI updates- summarize comments and description

• Remove experiment badges on buttons
• Add badge on autocomplete description header
• Rewords content

What does this MR not do?

• Add an alert in "populate description" modal (Add warning to issue description modal (!122361 - merged))
• Replace icon with new AI tanuki icon

Screenshots or screen recordings

	Before	After
View summary
Autocomplete

How to set up and validate locally

• AI set up
• Feature flags:
  • :summarize_notes
  • :summarize_comments
  • :generate_description_ai
• Go to issue
• Top right of activity feed shouldn't have Experiment badge on button
• Click edit
• Autocomplete button shouldn't have Experiment badge
• Click Autocomplete
• Modal should have Experiment badge in title

#411677 (closed)