CLI: Add Terminate Session command

[dkbennett]

Summary of the Pull Request

Enables session termination via session terminate command. Adds tests for session termination validation.

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

• Added session terminate command and related task plumbing.
• Added TerminateSession to the SessionService.
• Added Tests for session termination, with both elevation types and mixed elevation.
• Added a test for Session Create that verifies mixed elevation creation attempts fail.

Validation Steps Performed

Manual verification and all session tests run locally successfully.

[Copilot]

Pull request overview

Adds a new wslc session terminate CLI subcommand that terminates an active WSLC session, wires it through the task/service layers, and extends the Windows E2E test suite to validate termination behavior across elevated/non-elevated sessions.

Changes:

• Introduced session terminate command and hooked it into the session command tree.
• Added TerminateSession task + service implementation calling IWSLCSession::Terminate().
• Added/updated WSLC E2E tests and command-line parsing test cases; added a localized error string for termination failures.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
test/windows/wslc/e2e/WSLCE2EHelpers.h	Adds helper declaration for ensuring a session is terminated in E2E tests.
test/windows/wslc/e2e/WSLCE2EHelpers.cpp	Implements session termination helper via wslc session list/terminate.
test/windows/wslc/e2e/WSLCE2EGlobalTests.cpp	Adds E2E coverage for implicit/explicit/mixed-elevation termination and mixed-elevation create validation.
test/windows/wslc/CommandLineTestCases.h	Adds parser coverage for session terminate forms.
src/windows/wslc/tasks/SessionTasks.h	Exposes TerminateSession task entry point.
src/windows/wslc/tasks/SessionTasks.cpp	Implements terminate task (defaults to session default name when omitted).
src/windows/wslc/services/SessionService.h	Adds SessionService::TerminateSession API.
src/windows/wslc/services/SessionService.cpp	Implements termination via COM session manager + IWSLCSession::Terminate().
src/windows/wslc/commands/SessionTerminateCommand.cpp	New command implementation for session terminate.
src/windows/wslc/commands/SessionCommand.h	Declares SessionTerminateCommand in the session command tree.
src/windows/wslc/commands/SessionCommand.cpp	Registers the new terminate subcommand.
localization/strings/en-US/Resources.resw	Adds localized string for terminate failure message.

[Copilot]

Pull request overview

Copilot reviewed 12 out of 12 changed files in this pull request and generated 3 comments.

[Copilot]

Pull request overview

Copilot reviewed 12 out of 12 changed files in this pull request and generated 2 comments.

[benhillis]

LGTM!