Always print pushed digest in crane push

[aw185176]

Currently if you use --image-refs with crane push, the result reference doesn't get pushed if the manifest already exists, e.g.:

2024/01/03 21:50:41 existing manifest: sha256:eef3b150e5e8d2b5b9ff7ed861ba503e0093139f595f9a549f614b64b6d6e1b2
2024/01/03 21:50:45 existing manifest: dev@sha256:eef3b150e5e8d2b5b9ff7ed861ba503e0093139f595f9a549f614b64b6d6e1b2

This change ensures that crane push always prints the full reference that was pushed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (55ffb00) 71.65% compared to head (f20a366) 71.65%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1860   +/-   ##
=======================================
  Coverage   71.65%   71.65%           
=======================================
  Files         123      123           
  Lines        9928     9928           
=======================================
  Hits         7114     7114           
  Misses       2115     2115           
  Partials      699      699           

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