[BUG] babelify in transpiler assumes no ignored babel files

[asos-tomp]

Describe the bug

Could be same as #664...

The code here:

const options = babel.loadOptions ? babel.loadOptions({ filename }) : { plugins: [] }

...assumes, as per babel documentation:

...resulting in an options object where:

opts.plugins is a full list of Plugin instances.

However, if a file is ignored, the options are returned as null and the attempt to spread options.plugins:

plugins: [...extraPlugins, ...options.plugins]

... causes a failure:

Error:  TypeError: [BABEL]: Cannot read properties of null (reading 'plugins')

Perhaps we can alter the ternary to be:

var options = babel.loadOptions?.({ filename: filename }) ?? { plugins: [] };

See #804 that last touched this.

To Reproduce
Steps to reproduce the behavior:

1. Set an ignored file in .babelignore or ignore in config
2. Run danger

Expected behavior

File is ignored for babel transpilation, danger processes it without issue.

Your Environment

software	version
danger.js	11.3.0
node	22.3.0
npm	10.9.2
Operating System	macOS 14.7.1