Fix: Fail and warn the user when --uninstall is given parameters

[chemwolf6922]

Summary of the Pull Request

Fail and warn the user when --uninstall is given parameters. The user is likely misusing the command to uninstall the distro instead of uninstall WSL.

PR Checklist

• Closes: wsl --uninstall should warn users it's **not** for removing distribution. #13979
• 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

• Tested on my local system with wsl --uninstall Ubuntu
• Tested with the newly added unit test.

[chemwolf6922]

Recreating #14507 as the original PR is stuck on github.

[Copilot]

Pull request overview

This pull request updates wsl.exe argument parsing to prevent accidental full WSL uninstalls when users mistakenly pass a distro name to --uninstall (a common confusion with --unregister).

Changes:

• Rejects any extra arguments after --uninstall and prints a localized guidance message pointing users to --unregister.
• Adds a unit test validating the new rejection behavior and exit code.
• Introduces a new localized string for the user-facing message.

Reviewed changes

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

File	Description
src/windows/common/WslClient.cpp	Adds validation to fail fast if --uninstall is followed by any additional token(s).
test/windows/UnitTests.cpp	Adds a unit test asserting the new output and -1 exit code for --uninstall <arg>.
localization/strings/en-US/Resources.resw	Adds the new localized message string used by the CLI.