Merge branch 'fix-knapsack-for-spinach' into 'master'

Fix Knapsack report generation for Spinach

## What does this MR do?
Makes Knapsack auto-balacing work for Spinach tests

## Why was this MR needed?
We used wrong Knapsack adapter, thus making spinach to run split, but not auto-balanced tests for spinach.


See merge request !5230

features/support/env.rb

@@ -13,7 +13,7 @@ require_relative 'rerun'
 
 if ENV['CI']
   require 'knapsack'
-  Knapsack::Adapters::RSpecAdapter.bind
+  Knapsack::Adapters::SpinachAdapter.bind
 end
 
 %w(select2_helper test_env repo_helpers).each do |f|