Show breadcrumb on the new collaborations page

Fixes PLAT-1602

Test Plan
 - In the context of a group the bread crumb should
   show the collaborations link with the proper url
 - In the context of a course the bread crumb should
   show the collaborations link with the proper url

Change-Id: I3492491a7ca16ec19717e3771862de702984c364
Reviewed-on: https://gerrit.instructure.com/82377
Tested-by: Jenkins
Reviewed-by: Steven Burnett <sburnett@instructure.com>
QA-Review: Jahnavi Yetukuri <jyetukuri@instructure.com>
Product-Review: Matthew Sessions <msessions@instructure.com>

app/controllers/collaborations_controller.rb

@@ -151,6 +151,8 @@ class CollaborationsController < ApplicationController
     js_bundle :react_collaborations
     css_bundle :react_collaborations
 
+    add_crumb(t('#crumbs.collaborations', "Collaborations"),  polymorphic_path([@context, :lti_collaborations]))
+
     render :text => "".html_safe, :layout => true
   end