fix: support binary target in oras cp

[qweeah]

What this PR does / why we need it:
This PR fix a bug in oras cp: when copying with --resolve provided for destination target, the provided value will be silently ignored.

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 #842

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-commenter]

Codecov Report

Merging #843 (6222ee9) into main (fc7a82b) will decrease coverage by 0.31%.
The diff coverage is 25.00%.

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@@            Coverage Diff             @@
##             main     #843      +/-   ##
==========================================
- Coverage   67.54%   67.23%   -0.31%     
==========================================
  Files          21       21              
  Lines         875      876       +1     
==========================================
- Hits          591      589       -2     
- Misses        239      242       +3     
  Partials       45       45              

Impacted Files	Coverage Δ
cmd/oras/internal/option/target.go	19.56% <0.00%> (-0.66%)	⬇️
cmd/oras/internal/option/remote.go	70.53% <100.00%> (-0.29%)	⬇️

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[shizhMSFT]

LGTM