Turn on job throttling for Cirrus template jobs

Cirrus jobs that react to template changes are already lower priority then
those that react to direct edits but they seem to come in bursts and can
cause load spikes on the Elasticsearch servers.  We've lowered the maximum
number of concurrent in flight updates on the Elasticsearch side and raised
the maximum queue depth and timeout but that is much less elegant then
slowing down the jobs at the source with $wgJobBackoffThrottling.

Change-Id: I5aeda7cf610fb7e5cad082aec2c7fc682848bee3
Cirrus: Switch group1 wikis to all fields

This should improve performance.  Once we cut everything over we can remove
support for not querying the all fields which should allow us to shrink
the index somewhat.

Change-Id: I91ee6626e21709092ac49761941b90fb6ed2ed38
Merge "Cirrus: Switch group1 wikis to all fields"
Merge "Turn on job throttling for Cirrus template jobs"