Merge branch '3205-implement-new-ee-only-system-note-icons' into 'master'

Implement new EE-only system note icons

Closes #3205

See merge request !2713

app/views/shared/icons/_icon_anchor.svg

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app/views/shared/icons/_icon_anchor_broken.svg

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app/views/shared/icons/_icon_check.svg

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app/views/shared/icons/_icon_fa_close.svg

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