Allow people to suppress an ASR finding from within a report

[apburnes]

When a user is reviewing the site's automated site report, allow them to add/remove a finding in the report to the list of suppressed findings for their site.

Acceptance Criteria

• [ ] Double check that we're suppressing everything we could be. A lot of reports right now still seem to have unsuppressed false positives.
• [ ] Could we write/provide documentation on a per-rule basis about what we suppress (or recommend suppressing) and why?
• [ ] Create a POST request to the site's scan conf from a "suppress this finding" button on the report config settings
• [ ] Create an api endpoint to accept a POST request from the ASR to toggle a finding's suppression.