CmdPal: Rename id→appUserModelId in LaunchProfileCommand to remove ambiguity

[Copilot]

Summary of the Pull Request

LaunchProfileCommand had a constructor parameter id and backing field _id that held the Terminal AppUserModelId used for COM activation, which was ambiguous given the base class Id property (set to a generated command identifier via MakeId). Renames the parameter and field throughout to appUserModelId/_appUserModelId.

PR Checklist

• Communication: I've discussed this with core contributors already. If the work hasn't been agreed, this work might be rejected
• Tests: Added/updated and all pass
• Localization: All end-user-facing strings can be localized
• Dev docs: Added/updated
• New binaries: Added on the required places
  • JSON for signing for new binaries
  • WXS for installer for new binaries and localization folder
  • YML for CI pipeline for new test projects
  • YML for signed pipeline
• 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

Addresses review feedback on #46372. Changes in LaunchProfileCommand.cs:

• _id field → _appUserModelId
• Constructor parameter id → appUserModelId
• Private Launch(string id, ...) → Launch(string appUserModelId, ...)

Before, both the activation ID and the command identity used id-derived names, making it easy to accidentally pass the wrong value. The MakeId static method already used appUserModelId as its parameter; this aligns the rest of the class with that convention.

// Before
private readonly string _id;
internal LaunchProfileCommand(string id, ...) { this._id = id; this.Id = MakeId(id, profile); }

// After
private readonly string _appUserModelId;
internal LaunchProfileCommand(string appUserModelId, ...) { this._appUserModelId = appUserModelId; this.Id = MakeId(appUserModelId, profile); }

Validation Steps Performed

• Code review: no issues flagged.
• Caller site (ProfilesListPage.cs) already passes profile.Terminal.AppUserModelId — no functional change.

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