Action only returns the first 300 changed files

[tomasmv]

I'm only seeing the first 300 files returned when I run this action. Even though there should be more files diffed between the commits. I don't think the action is currently going through the paginated results and pulling later pages. When we merge our staging branch into our release branch, sometimes we have over 300 files that were modified over the course of a week. Having the truncated changed files list keeps us from being able to execute all of the actions we want.