Fix port conflict error message and cleanup on failure

[beena352]

Summary of the Pull Request

Fix port conflict error message in wslc container run. When starting a container on a port that is already in use, users previously saw the misleading message “A distribution with the supplied name already exists.” With this fix, the correct error is shown (for example, “Port 8080 is already in use, cannot start container ”). Also clean up the container left behind when Start() fails.

PR Checklist

• Closes: Link to issue #xxx
• [ x] 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

Validation Steps Performed

[Copilot]

Pull request overview

Updates WSLC container startup to surface a correct “port already in use” error to users (instead of a misleading “distribution already exists” message) and ensures containers are cleaned up when Start() fails during wslc container run.

Changes:

• Switch port-conflict handling to THROW_HR_WITH_USER_ERROR(_IF) so a user-facing message can be surfaced.
• Add error translation around MapPort() to try to convert port-conflict failures into a clearer user error.
• Fix wslc container run failure cleanup by only disabling auto-delete after a successful Start().

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.

File	Description
src/windows/wslcsession/WSLCContainer.cpp	Improves port-conflict error surfacing during port allocation/mapping for container open/start.
src/windows/wslc/services/ContainerService.cpp	Ensures container run doesn’t leak containers when Start() fails by keeping auto-delete enabled until after a successful start.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

[benhillis]

Hey @beena352 👋 — Following up on this draft PR. There are 2 unresolved review threads:

• Hardcoded strings that need localization
• Port reporting inconsistency in host networking mode

Is this change still being worked on? Addressing those review items would help move this forward.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.