feat: allow Sentry uWSGI-plugin to be optional

Use ENABLE_SENTRY_UWSGI_PLUGIN-flag to control
Sentry uWSGI-plugin usage. Disable it by default.

Refs: ATV-248

Author: mhieta

.prod/uwsgi.ini

@@ -43,7 +43,7 @@ disable-write-exception = true
 
 plugin-dir = /usr/local/lib/uwsgi/plugins
 
-if-env = SENTRY_DSN
+if-env = ENABLE_SENTRY_UWSGI_PLUGIN
 print = Enabled sentry logging for uWSGI
 plugin = sentry
 alarm = logsentry sentry:dsn=$(SENTRY_DSN),logger=uwsgi.sentry