Add wslc cp alias for wslc container cp

[ggarzia-MSFT]

Adds wslc cp as a top-level alias for wslc container cp. matching docker cp

Also allows for adding usage examples to a command's help output

[Copilot]

🟡 Changes recommended

The new alias’s help text incorrectly advertises only the nested command spelling.

1 open finding

• Root alias help shows incorrect wslc container cp examples · New

What changed in this PR

Adds wslc cp as a top-level alias for wslc container cp.

Changes:

• Registers the existing container copy command at the root.
• Adds parsing tests for the new alias.

File	Description
src/​windows/​wslc/​commands/​RootCommand.cpp	Registers the top-level cp command.
test/​windows/​wslc/​CommandLineTestCases.h	Tests basic alias parsing and -L.

🧠 Review effort: Balanced

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[Copilot]

🟡 Changes recommended

Existing locale-specific long descriptions will produce stale and duplicated help output, and the new alias help path lacks execution-level coverage.

2 open findings

• Avoid stale localized cp help descriptions · New
• Add help-output tests for cp aliases · New

1 resolved since last review

• Root alias help shows incorrect wslc container cp examples

🧠 Review effort: Balanced

[Copilot]

🟢 Approval recommended

The alias, invocation-aware help output, localization, and parsing behavior are implemented consistently and covered by tests.

0 open findings

2 resolved since last review

• Avoid stale localized cp help descriptions
• Add help-output tests for cp aliases

🧠 Review effort: Balanced

[Copilot]

🟡 Changes recommended

The advertised help-example capability is absent, and existing examples are removed.

1 open finding

• Help output removes container cp examples instead of adding support · New

🧠 Review effort: Balanced

[ranm-msft]

Approving.

Checked that the help-output change is byte-identical for the non-full-help path, so the only rendering difference is in full help. The localization placeholders are correctly moved into non-localized C++ literals rather than being left inside the localized strings, which is the right split. Tests were added for both cp --help and container cp --help.