🛠️ Script for reliable API build cleanup

[JFWooten4]

I ran into a problem when changing files unrelated to the API sections, which showed up in #2448 (comment). The current script build command generates the API docs and then uses rm to delete all *.info.mdx files. However, this runs through the actual command shorthand in the shell glob/brace expansion, which behaves differently depending on the shell/OS.

These errors showed up on my Windows setup, even though they don't appear on OSX. This PR changes the script to use a Node cleanup environment with fs/promises that works on all platforms. It also paves the way for more intricate post-generation formatting as formulated in the APN notes from #2418.

[Copilot]

Pull request overview

This PR replaces shell-specific rm glob/brace cleanup in the API docs generation pipeline with a cross-platform Node-based cleanup script, addressing Windows shell incompatibilities encountered during yarn api:gen.

Changes:

• Added scripts/api-build-cleanup.mjs to remove generated *.info.mdx files via fs/promises in a platform-independent way.
• Updated package.json api:gen script to run the new Node cleanup step after docusaurus gen-api-docs all.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
scripts/api-build-cleanup.mjs	Adds a Node-based cleanup routine that deletes *.info.mdx files in known API output directories, tolerating missing directories.
package.json	Replaces shell rm glob/brace expansions with node scripts/api-build-cleanup.mjs for reliable cross-platform execution.

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