refactor(artifact): refactoring scan and tag subcommands under artifacts

[NucleoFusion]

The current structure has the scan and tags subcommand under the artifact root command in one singular file and not the correct file structure

[codecov]

Codecov Report

❌ Patch coverage is 0% with 133 lines in your changes missing coverage. Please review.
✅ Project coverage is 7.15%. Comparing base (60ad0bd) to head (37af5af).
⚠️ Report is 92 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/harbor/root/artifact/tags/list.go	0.00%	33 Missing ⚠️
cmd/harbor/root/artifact/tags/create.go	0.00%	26 Missing ⚠️
cmd/harbor/root/artifact/tags/delete.go	0.00%	26 Missing ⚠️
cmd/harbor/root/artifact/scan/stop.go	0.00%	24 Missing ⚠️
cmd/harbor/root/artifact/scan/scan.go	0.00%	11 Missing ⚠️
cmd/harbor/root/artifact/tags/tags.go	0.00%	11 Missing ⚠️
cmd/harbor/root/artifact/cmd.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             main    #700      +/-   ##
=========================================
- Coverage   10.99%   7.15%   -3.84%     
=========================================
  Files         173     265      +92     
  Lines        8671   12878    +4207     
=========================================
- Hits          953     922      -31     
- Misses       7612   11848    +4236     
- Partials      106     108       +2     

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[qcserestipy]

LGTM

[bupd]

/lgtm