[writer] skip reference saving when paths are equal instead of checking existence

6 jobs for nxw_existing_ref_proxy in 54 minutes and 12 seconds (queued for 1 second)
Status Job ID Name Coverage
  Style
passed #103461
check_lint

00:00:18

passed #103460
check_style

00:00:24

 
  Tests
passed #103462
test_bliss

00:50:28

passed #103463
test_writer

00:32:26

 
  Build
passed #103464
create_reference_doc

00:03:19

passed #103465
create_user_doc

00:02:28