CmdPal: Add configuration option for Escape key behavior

[jiripolasek]

Summary of the Pull Request

Caution

This implements the feature request, but the design needs more polish:
TBD:

• Always dismiss clashes with Go home when activated, that's not intuitive

• Options are in two different sections:

  • Activation:
    • Go home when activated
  • Behavior:
    • Backspace go back
    • Escape key behavior

• Drop-down item labels

This PR adds a new option to the General page in Settings:

Escape key behavior — a dropdown with the following choices:

• Clear search first, then go back

  • Current behavior.
  • If the search box contains text, it is cleared; otherwise goes back.
  • On the home page, CmdPal is dismissed.

• Always go back

  • Leaves the search text intact.
  • If the page is not transient, the search text reappears when returning.
  • On the home page, CmdPal is dismissed.

• Always dismiss

  • Immediately dismisses CmdPal and navigates to the home page.
  • Ignores the Go home when activated setting.
  • Search text is cleared.

This implementation preserves existing behavior, except for Always dismiss, which always forces navigation to the home page.

Pictures? Pictures!

PR Checklist

• Closes: Add a setting for what esc does #38311
• 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

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