jobs: add ability to search jobs on /jobs page.

Add ability to search jobs on the /jobs page by job type or by status.

Fixes #2577 (Search filters for delayed jobs). This wasn't possible
before with DelayedJobs because it stored the job data in a YAML string,
which made it difficult to search jobs by type. GoodJobs stores job data
in a JSON object, which is easier to search in Postgres.

app/logical/concerns/searchable.rb

@@ -256,6 +256,8 @@ module Searchable
     case type
     when :string, :text
       search_text_attribute(name, params)
+    when :uuid
+      search_uuid_attribute(name, params)
     when :boolean
       search_boolean_attribute(name, params)
     when :integer, :float, :datetime, :interval
@@ -385,6 +387,24 @@ module Searchable
     relation
   end
 
+  def search_uuid_attribute(attr, params)
+    relation = all
+
+    if params[attr].present?
+      relation = relation.where(attr => params[attr])
+    end
+
+    if params[:"#{attr}_eq"].present?
+      relation = relation.where(attr => params[:"#{attr}_eq"])
+    end
+
+    if params[:"#{attr}_not_eq"].present?
+      relation = relation.where.not(attr => params[:"#{attr}_not_eq"])
+    end
+
+    relation
+  end
+
   def search_association_attribute(attr, params, current_user)
     association = reflect_on_association(attr)
     relation = all