fix(gatsby-plugin-mdx): Ensure getNodesByType helper is passed to gatsbyRemarkPlugins

[kamranayub]

Description

Ensures getNodesByType is passed on to Gatsby Remark plugins

Documentation

Docs already exist that suggest this should be passed on (see issue).

Related Issues

Fixes #24400

[kamranayub]

I think this is all that needs to change but I can test it locally before marking Ready for Review. I could see about adding a test as well perhaps.

[kamranayub]

Confirmed this fixes my plugin if I try and destructure getNodesByType

[laurieontech]

Looks good! Thanks!

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