Add new enableTooltipsOnTags prop to Select

[cnrudd]

…Multi is true.

There is a corresponding Toolbox
PR: xh/toolbox#649
and branch: https://github.com/xh/toolbox/tree/selectTagToolTips

which demo this new prop enableTooltipsOnTags.

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• Caught up with develop branch as of last change.
• Added CHANGELOG entry.
• Reviewed for breaking changes: no breaking changes.
• Updated doc comments: done
• Reviewed and tested on Mobile: not required.
• Created Toolbox branch: https://github.com/xh/toolbox/tree/selectTagToolTips

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[amcclain]

This looks good to me. I think it's worth it to use the BP tooltips, despite the small amount of extra complexity over (say) using a div with a title attribute. The BP tooltips are nicer and it seems like the required style override is very reasonable and we're not seeing any other negative side effects.