chore(ux): give recommendation when empty creds found during basic auth

[qweeah]

What this PR does / why we need it:
This PR improves the error output when doing basic authentication.
Before

$ oras pull localhost:7000/test:123 --registry-config test.config 
Error: failed to resolve 123: GET "http://localhost:7000/v2/test/manifests/123": credential required for basic auth

After

$ oras pull localhost:7000/test:123 --registry-config test.config
Error: failed to resolve 123: basic credential not found
Please check whether the registry credential stored in the authentication file at "test.config" is correct

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Depends on merging of #1222, resolves #1236

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: 4 lines in your changes are missing coverage. Please review.

Comparison is base (0514a57) 81.46% compared to head (76d7e80) 81.55%.

Files	Patch %	Lines
cmd/oras/internal/option/remote.go	84.00%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1235      +/-   ##
==========================================
+ Coverage   81.46%   81.55%   +0.09%     
==========================================
  Files          68       68              
  Lines        3749     3789      +40     
==========================================
+ Hits         3054     3090      +36     
- Misses        487      490       +3     
- Partials      208      209       +1     

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[shizhMSFT]

LGTM with suggestions

[shizhMSFT]

LGTM