Consider adding MOZ_SERVICES_HEALTHREPORT to mozconfig
Someone suggested on the blog that we unset `MOZ_SERVICES_HEALTHREPORT` in mozconfig:
https://blog.torproject.org/comment/285469#comment-285469
Apparently unsetting this would avoid including the file `toolkit/components/telemetry/healthreport-prefs.js`, which currently contains:
```
pref("datareporting.healthreport.infoURL", "https://www.mozilla.org/legal/privacy/firefox.html#health-report");
pref("datareporting.healthreport.uploadEnabled", true);
```
We already set `datareporting.healthreport.uploadEnabled` to false, so this wouldn't fix any issue, but would be defense in depth.
issue