Update agent init E2E tests for selection flow

[IEvangelist]

Description

Updates the aspire agent init end-to-end tests to match the refactored selection flow.

• switches the agent-init E2E assertions from the old agent-environment prompts to the new skill-location and skill-selection prompts
• updates the Playwright CLI installer scenarios to explicitly select the Claude Code skill location under the new flow
• removes the stale deprecated-scan debug-log expectation from the migration test so it validates the actual config migration behavior

Fixes # (issue)

Checklist

• Is this feature complete?
  • Yes. Ready to ship.
  • No. Follow-up changes expected.
• Are you including unit tests for the changes and scenario tests if relevant?
  • Yes
  • No
• Did you add public API?
  • Yes
    • If yes, did you have an API Review for it?
      • Yes
      • No
    • Did you add <remarks /> and <code /> elements on your triple slash comments?
      • Yes
      • No
  • No
• Does the change make any security assumptions or guarantees?
  • Yes
    • If yes, have you done a threat model and had a security review?
      • Yes
      • No
  • No
• Does the change require an update in our Aspire docs?
  • Yes
    • Link to aspire.dev issue:
      • New issue
  • No