UI Improvements for selecting files in Duo Chat

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These are follow-ups to: https://gitlab.com/gitlab-org/gitlab/-/issues/477564#note_2037765901

• Discoverability could be poor for this feature. One idea for immediate improvement is to change the default help text from type / for slash commands to something more specific and potentially indicating that files can be added
• If we like the popover containing details about a file, how can we give it some UI polish?
• Files aren't available (and currently shown disabled in light grey) when they are in a project where Duo Chat isn't enabled. There is also an error shown in the tooltip for the file. We think this can be improved - up to a designer to decide how.
• Any other UI polish a designer wants to add to improve this initial release