refactor: pass cobra.Command to all cmd exec functions

[TerryHowe]

What this PR does / why we need it:
This is a minor refactor to make the command private methods consistent. Most of them take a cmd and not a context except for these six. The reason for this is to make logging and output more consistent across the commands and thecorbra.Command has methods like OutOrStdout

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 #

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

Attention: Patch coverage is 83.33333% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 81.90%. Comparing base (777d750) to head (bd13588).

Files	Patch %	Lines
cmd/oras/root/logout.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1285      +/-   ##
==========================================
- Coverage   81.92%   81.90%   -0.03%     
==========================================
  Files          83       83              
  Lines        3995     3996       +1     
==========================================
  Hits         3273     3273              
- Misses        499      500       +1     
  Partials      223      223              

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[qweeah]

@TerryHowe Can you help make the PR title complaint to conventional commits? E.g. for this PR it can be refactor: pass cobra.Command to all cmd exec functions

[qweeah]

LGTM

[shizhMSFT]

LGTM