Switch VCR record mode to :none

This avoids recording cassettes when we run our tests in CI in case the PR author didn't already record them. This also helps us catch instances where the cassette itself might be poorly recorded; a test with the :vcr annotation can have its cassette change in subsequent runs if the test doesn't contain a description

This may reveal that we have other poorly recorded tests in our codebase

common/spec/spec_helper.rb

@@ -72,8 +72,9 @@
   end
 
   # Let's you set default VCR mode with VCR=all for re-recording
-  # episodes. :once is VCR default
-  record_mode = ENV["VCR"] ? ENV["VCR"].to_sym : :once
+  # episodes. We use :none here to avoid recording new cassettes
+  # in CI if it doesn't already exist for a test
+  record_mode = ENV["VCR"] ? ENV["VCR"].to_sym : :none
   config.default_cassette_options = { record: record_mode }
 end