fix(babel-preset-app): multiPage repo add option entryFileList

[WilsonLiu95]

To inject polyfills to all entry file.
Multi page repo now will be only inject polyfills to the first entry file.And the queue of entry file list may be different.So the hash may change in different machine.
We should inject polyfills to all entry file.

[haoqunjiang]

Thank you so much for this pull request!
So I finally figured out what caused this issue: #2983

Actually, due to the presence of thread-loader it is not possible to reliably determine the real entry file. I think we can just remove the entryFile logic and only rely on the entryFileList option, and then automatically set this field in @vue/cli-plugin-babel so that users don't need to be aware of this change (this can be done in a separate pull request though).

[WilsonLiu95]

yes, due to the presence of thread-loader and cache-loader.When JS file is cache then the first file will be change.

I have change the name to entryFiles.