fix: add digest to fetched status output of manifest index create

[wangxiaoxuan273]

What this PR does / why we need it:
Display after change

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #1576

Please check the following list:

• Does the affected code have corresponding tests, e.g. unit test, E2E test?
• Does this change require a documentation update?
• Does this introduce breaking changes that would require an announcement or bumping the major version?
• Do all new files have an appropriate license header?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.24%. Comparing base (983791c) to head (a20c926).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1579      +/-   ##
==========================================
- Coverage   84.27%   84.24%   -0.03%     
==========================================
  Files         120      120              
  Lines        5392     5395       +3     
==========================================
+ Hits         4544     4545       +1     
- Misses        602      604       +2     
  Partials      246      246              

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[qweeah]

LGTM