wslc: add --all to image list for docker parity

[ggarzia-MSFT]

Summary of the Pull Request

Adds --all / -a to wslc image list (and its image ls / images spellings), matching docker images --all. The service already accepted a WSLCListImagesFlagsAll flag; only the CLI needed to expose it.

PR Checklist

• Closes: Link to issue #xxx
• Communication: I've discussed this with core contributors already. If work hasn't been agreed, this work might be rejected
• Tests: Added/updated if needed and all pass
• Localization: All end user facing strings can be localized
• Dev docs: Added/updated if needed
• Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

WSLCListImagesFlagsAll was already defined in WSLCShared.idl and already honored end to end: WSLCSession::ListImages unpacks it and forwards it to Docker().ListImages(all, digests, filters). The CLI simply never set it, so there was no way to reach the behavior from wslc.

• ImageListCommand registers ArgType::All with a description override, following the existing ImagePruneCommand / VolumePruneCommand pattern. ArgType::All already carries the -a alias, so no new argument type was needed.
• ImageService::List takes a new defaulted bool all and sets the flag. Flag assembly switched to WI_SetFlagIf so the two independent flags compose instead of overwriting each other.
• GetImages reads the argument and forwards it.
• New localized description WSLCCLI_ImageListAllArgDescription, worded to match docker: "Show all images (default hides intermediate images)."

Validation Steps Performed

All new and existing tests in the touched areas were run against a locally deployed build. 21/21 pass.

Unit test:

• WSLCCLICommandUnitTests::ImageListCommand_HasAllArgument — asserts both the image list and root-scoped images constructions register --all with the -a alias as an optional flag. The root spelling is built through a separate constructor overload, so it is covered explicitly.

E2E tests (WSLCE2EImageListTests, 20 total, 3 new):

• All_IsSupersetOfDefault — every image ID listed by image list --quiet --no-trunc must also appear under --all, -a, and images --all. Asserting a superset rather than an exact set keeps the test stable whether or not intermediate images happen to exist.
• All_ListsLoadedImage — the loaded Debian test image is still present with --all.
• All_ListedInHelp — --all and its localized description appear in image list --help.

[Copilot]

Pull request overview

This PR exposes the already-supported WSLCListImagesFlagsAll behavior via the wslc CLI by adding --all / -a to wslc image list (and the images spelling), aligning behavior with docker images --all.

Changes:

• Add --all (-a) to ImageListCommand with a localized help description.
• Thread the new CLI flag through GetImages into ImageService::List, composing flags via WI_SetFlagIf.
• Add unit and E2E coverage validating argument registration, help output, and that --all is a superset of the default listing.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test/windows/wslc/WSLCCLICommandUnitTests.cpp	Adds a unit test verifying --all/-a is registered for both image list and images.
test/windows/wslc/e2e/WSLCE2EImageListTests.cpp	Adds E2E tests covering --all behavior (superset property), presence of loaded image, and help text.
src/windows/wslc/tasks/ImageTasks.cpp	Plumbs ArgType::All from parsed args into the image listing call.
src/windows/wslc/services/ImageService.h	Extends ImageService::List signature with a defaulted all parameter.
src/windows/wslc/services/ImageService.cpp	Sets WSLCListImagesFlagsAll (and composes with other flags) when requested.
src/windows/wslc/commands/ImageListCommand.cpp	Registers ArgType::All with a command-specific localized description override.
localization/strings/en-US/Resources.resw	Adds WSLCCLI_ImageListAllArgDescription localized string for --all help text.

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