Added day name to contributions calendar

Closes #19367

CHANGELOG

@@ -11,6 +11,7 @@ v 8.10.0 (unreleased)
   - Apply the trusted_proxies config to the rack request object for use with rack_attack
   - Add Sidekiq queue duration to transaction metrics.
   - Let Workhorse serve format-patch diffs
+  - Added day name to contribution calendar tooltips
   - Make images fit to the size of the viewport !4810
   - Fix check for New Branch button on Issue page !4630 (winniehell)
   - Fix MR-auto-close text added to description. !4836

app/assets/javascripts/lib/utils/datetime_utility.js.coffee

@@ -2,10 +2,14 @@
 
   w.gl ?= {}
   w.gl.utils ?= {}
+  w.gl.utils.days = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday']
 
   w.gl.utils.formatDate = (datetime) ->
     dateFormat(datetime, 'mmm d, yyyy h:MMtt Z')
 
+  w.gl.utils.getDayName = (date) ->
+    this.days[date.getDay()]
+
   w.gl.utils.localTimeAgo = ($timeagoEls, setTimeago = true) ->
     $timeagoEls.each( ->
           $el = $(@)

app/assets/javascripts/users/calendar.js.coffee

@@ -87,14 +87,15 @@ class @Calendar
       .attr 'width', @daySize
       .attr 'height', @daySize
       .attr 'title', (stamp) =>
+        date = new Date(stamp.date)
         contribText = 'No contributions'
 
         if stamp.count > 0
           contribText = "#{stamp.count} contribution#{if stamp.count > 1 then 's' else ''}"
 
-        date = dateFormat(stamp.date, 'mmm d, yyyy')
+        dateText = dateFormat(date, 'mmm d, yyyy')
 
-        "#{contribText}<br />#{date}"
+        "#{contribText}<br />#{gl.utils.getDayName(date)} #{dateText}"
       .attr 'class', 'user-contrib-cell js-tooltip'
       .attr 'fill', (stamp) =>
         if stamp.count isnt 0