[Browser test] New test for multi-edit workflow

1) Per reviewer comments, moved some of the verbosity
   from feature to steps file in order to make
   the feature file a little more readable.
2) Using random strings for the text of each edit
   in order to make every edit unique.
3) Removing a commented line that wasn't needed.

Bug: 57654

Change-Id: Ib8b15964436d9c24556fac32977a64e2d5f22044