Short navigation jobs count

This patch defines the `number_to_human` format and units option to make the
navigation section titles more compact and readable.

As an example, instead of "Finished Jobs (4.4 Thousand)" it will now display
"Finished Jobs (4.4K)".

https://api.rubyonrails.org/classes/ActiveSupport/NumberHelper.html#method-i-number_to_human

app/helpers/mission_control/jobs/navigation_helper.rb

@@ -47,6 +47,18 @@ def jobs_filter_param
 
   def jobs_count_with_status(status)
     count = ActiveJob.jobs.with_status(status).count
-    count.infinite? ? "..." : number_to_human(count)
+    if count.infinite?
+      "..."
+    else
+      number_to_human(count,
+        format: "%n%u",
+        units: {
+          thousand: "K",
+          million: "M",
+          billion: "B",
+          trillion: "T",
+          quadrillion: "Q"
+        })
+    end
   end
 end