fix: make --output - implies --no-tty

[wangxiaoxuan273]

What this PR does / why we need it:

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 #1268

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 81.99%. Comparing base (9dbac04) to head (d63ec03).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1286      +/-   ##
==========================================
+ Coverage   81.95%   81.99%   +0.04%     
==========================================
  Files          83       83              
  Lines        3996     4005       +9     
==========================================
+ Hits         3275     3284       +9     
  Misses        498      498              
  Partials      223      223              

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[wangxiaoxuan273]

As per comment in the issue, now --output - implies --no-tty in oras blob fetch, but we also allow users to explicitly put --no-tty=false with --output -.

Current display:

[qweeah]

LGTM with minor suggestion: suggest to align unit test description with real e2e use case.