Aaron Jorbin 99d6c67148 Enable users to initiate a shiny update from plugin detail modal
The plugin detail modal can contain a link to update a plugin.  When it does, we should initiate a shiny update.

This relies upon postMessage which isn't available in all browsers, specifically it isn't in IE versions below 8 so this is going to be a progressive enhancement that some small percentage of users will miss out on.  These are the same users that can't use the customizer. 

Fixes #31739



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git-svn-id: http://core.svn.wordpress.org/trunk@32041 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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