[code-infra] Make Babel config path configurable in API docs builder

[michaldudak]

The Babel configuration path in the API docs builder was hardcoded, causing problems when the package was used in other repositories.
Added the relevant configuration field (defaulting to the previous value).

[mui-bot]

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[Janpot]

I think it should be possible to leverage @babel/core API loadPartialConfig to detect the config file location that applies to a file automatically. It's not super well documented, but it seems like the following returns a config location

// config property should contain the path to the project babel.config.js file that applies to `pathToCodeFile`
const { config } = babelCore.loadPartialConfig({ fileName: pathToCodeFile })

[michaldudak]

Thanks! I didn't realize Babel would look for the config automatically.
Looks like it works well in both Core and Base UI repos.

[Janpot]

Nice, thanks for checking. Approving under the assumption the babelConfigPath setting will be removed.