[IDC-2006] - optional mailTo for debugging extension. (#2027)

* WIP debug dialog

* Rename the p10 downloader extension to debugger extension, add button to toolbar. Deactivate it by default.

* Fix unit tests

* WIP

* WIP

* Finish mailTo

extensions/debugging/src/DebugReportModal.css

@@ -2,3 +2,8 @@
   padding: 10px 0 10px;
   color: var(--active-color);
 }
+
+.debug-report-modal-container {
+  display: flex;
+  flex-direction: column;
+}