* MM-14446: consider subpath when evaluating if url is internal
When clicking on an URL with `target=_blank`, the webview decides if it should launch an external browser or a new window within the Electron application. Update this logic to consider the application's configured subpath so as to treat links outside the subpath but on the same domain as external.
* fix licensing on new file
* fix .eslintrc.json indentation
* tweak header eslint rules for specific files
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