Allow disabling line highlighting on click in `PhabricatorSourceCodeView`
Summary:
There may be times when we don't want lines in some embeded source
code to be highlighted on click, this adds that functionality.
Also use the functionalty in `PasteEmbedView`
Test Plan:
- View paste, make sure everything works.
- Embed paste in comment, make sure everything works apart from click hl
Reviewers: epriestley
Reviewed By: epriestley
CC: Korvin, aran
Maniphest Tasks: T3881
Differential Revision: https://secure.phabricator.com/D7111
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