Remove last references to job for pipeline charts

This is not ammended to another commit as it will probably have failing
tests which I'll fix and amend to this commit.

app/views/projects/pipelines/charts/_overall.haml

@@ -2,13 +2,13 @@
 %ul
   %li
     Total:
-    %strong= pluralize @counts[:total], 'job'
+    %strong= pluralize @counts[:total], 'pipeline'
   %li
     Successful:
-    %strong= pluralize @counts[:success], 'job'
+    %strong= pluralize @counts[:success], 'pipeline'
   %li
     Failed:
-    %strong= pluralize @counts[:failed], 'job'
+    %strong= pluralize @counts[:failed], 'pipeline'
   %li
     Success ratio:
     %strong