Add ability to run on workflow_dispatch

[sc0ttkclark]

Having PR runs is great but I'd love to run on a workflow_dispatch so that I could have it looking at the whole codebase. This wouldn't add comments inline but at least it could give me a pass/fail status on the action run as well as further detail in the action log for what failed.

Tasks

Beta Give feedback

1. Add logic to use current git ref instead of looking at PR event info, if PR event not available
2. If not looking at a PR event, bypass PR comments/review logic