Summary
• Allow custom CISA vulnerability data source URL to work around blocked
requests
• Updates vulnerability sync logic to use configurable CISA endpoint
• Enables organizations to use CISA mirrors when direct access is
blocked
## Testing
- [x] Added/updated automated tests
- [x] QA'd all new/changed functionality manually
`go-kit/kit/log` was deprecated and generating warnings
# Checklist for submitter
If some of the following don't apply, delete the relevant line.
<!-- Note that API documentation changes are now addressed by the
product design team. -->
- [x] Manual QA for all new/changed functionality
* WIP
* Add more logging
* Check rate limit at end of action
* Add github client in more places
* Add new published firefox 93 vulnerabilities to tests
* Remove fmt printfs
* Restore CI check settings
* Readd newline
