views: Move js code to separate file

views: Move js code to separate file

Move patch-list related JS code to a new patch-list.js file, to
make the JavaScript easy to read and change in one place. This makes
automatic code formatting easier, makes it more straightforward to
measure test coverage and discover opportunities for refactoring, and
simplifies a possible future migration to TypeScript if the project
chooses to go in that direction.

No user-visible change should be noticed.

Signed-off-by: Raxel Gutierrez <raxel@google.com>
Signed-off-by: Stephen Finucane <stephen@that.guru>
[stephenfin: Addressed merged conflicts]