Selectable popover text (#12918)

Release Notes:

- Fixed #5236
- Added the ability to select and copy text from information popovers



https://github.com/zed-industries/zed/assets/50590465/d5c86623-342b-474b-913e-d07cc3f76de4

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Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>
Co-authored-by: Antonio <ascii@zed.dev>