Revert introduction of build steps (temporary)

[dmsnell]

Please ignore this branch. It will be maintained with revert commits of the recently-introduced Gutenberg build steps that break a clean checkout.

DO NOT MERGE as this is meant for development and not for trunk.

To use: merge this into your branch with git merge --no-ff build/revert-gutenberg-merge. If you rebase, use --rebase-merges to maintain the merge commit.

[github-actions]

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