Move shared note styles into new file

Annabel Dunstone Grayrequested to merge
shared-notes into master

What does this MR do and why?

  • Creates new CSS file notes/notes_shared.scss for shared styles between issuables and work items
  • Removes duplicated styles coming from system_notes_v2 (and future CSS files) being imported twice

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No visual changes

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Edited by Annabel Dunstone Gray

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