perf(gatsby-plugin-mdx): Use getNodesByType for plugin transformation #22555
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Since getSourcePluginsAsRemarkPlugins is called on
every MDX file, the getNodes call became expensive
at scale with thousands of MDX files.
This was encountered when attempting to find
underlying issues for #22521. @pvdz had a hunch that
node traversal may be a culprit. This doesn't fully
address all underlying performance issues but
is a quick win.
8k MDX pages: 440s => 350s
16k MDX pages: 1100s => 750s