Bot UI: highlighted show/hide code block string
Description
Added icon and changed color.
Checklist
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MR description has been reviewed -
MR changes are functionally tested -
MR does NOT have API/CLI changes OR there are API/CLI changes and they have been reviewed & DOCS ARE ADJUSTED (reference doc, etc) -
MR does NOT have UI changes OR there are UI changes and they have been reviewed & UX IS REVIEWED