fix(plugin-netlify-cms): set global window vars required for Gatsby components #20264
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Fixes #19898
Netlify CMS supports registering Gatsby components as preview templates. Some of these components (
gastby-link
in the issue above) use global window variables set here.The CMS plugin bundles the CMS as a separate React app thus needs to set these manually.
I'm stubbing the
___loader
since preloading is not required for the CMS previews.Not sure this is the best approach though.