Convert seconds to minutes and hours on chat notifationszj-chat-message-pretty-time

In the pipeline message, the duration of the pipeline was shown as:

> gitlab-org/gitlab-ee: Pipeline #8002259 of master branch by Douwe Maan
failed in 8612 seconds

But this many seconds only gave me a clue how long the pipeline took,
so now this will be shown as something like: 02:20:12 which gives a much
better measure of time.

2 files changed, 14 insertions, 7 deletions

diff --git a/app/models/project_services/chat_message/base_message.rb b/app/models/project_services/chat_message/base_message.rb
index 7621a5fa2d8..e2ad586aea7 100644
--- a/app/models/project_services/chat_message/base_message.rb
+++ b/app/models/project_services/chat_message/base_message.rb
@@ -50,5 +50,16 @@ module ChatMessage
     def link(text, url)
       "[#{text}](#{url})"
     end
+
+    def pretty_duration(seconds)
+      parse_string =
+        if duration < 1.hour
+          '%M:%S'
+        else
+          '%H:%M:%S'
+        end
+
+      Time.at(seconds).utc.strftime(parse_string)
+    end
   end
 end
diff --git a/app/models/project_services/chat_message/pipeline_message.rb b/app/models/project_services/chat_message/pipeline_message.rb
index 4628d9b1a7b..47b68f00cff 100644
--- a/app/models/project_services/chat_message/pipeline_message.rb
+++ b/app/models/project_services/chat_message/pipeline_message.rb
@@ -15,7 +15,7 @@ module ChatMessage
       @ref_type = pipeline_attributes[:tag] ? 'tag' : 'branch'
       @ref = pipeline_attributes[:ref]
       @status = pipeline_attributes[:status]
-      @duration = pipeline_attributes[:duration]
+      @duration = pipeline_attributes[:duration].to_i
       @pipeline_id = pipeline_attributes[:id]
     end
 
@@ -37,7 +37,7 @@ module ChatMessage
       {
         title: "Pipeline #{pipeline_link} of #{branch_link} #{ref_type} by #{user_name} #{humanized_status}",
         subtitle: "in #{project_link}",
-        text: "in #{duration} #{time_measure}",
+        text: "in #{pretty_duration(duration)}",
         image: user_avatar || ''
       }
     end
@@ -45,7 +45,7 @@ module ChatMessage
     private
 
     def message
-      "#{project_link}: Pipeline #{pipeline_link} of #{branch_link} #{ref_type} by #{user_name} #{humanized_status} in #{duration} #{time_measure}"
+      "#{project_link}: Pipeline #{pipeline_link} of #{branch_link} #{ref_type} by #{user_name} #{humanized_status} in #{pretty_duration(duration)}"
     end
 
     def humanized_status
@@ -84,9 +84,5 @@ module ChatMessage
     def pipeline_link
       "[##{pipeline_id}](#{pipeline_url})"
     end
-
-    def time_measure
-      'second'.pluralize(duration)
-    end
   end
 end