Add qbcapture extension to open codesite links in QuickBug.

- Opens in QuickBug by default.
- Escape hatch adds no_qbug=1 query parameter.
- The extension sees that and whitelists the tab.
- Future requests for whitelisted tabs are still canceled, but instead
  of opening QuickBug it re-runs the original request with no_qbug=1.