Add status indicator tests

[ConnorQi01]

Summary

This PR adds test coverage for status bar indicator behaviors in extension unit tests.

Background

Status bar behavior for active device name and packager port can regress without targeted tests. This PR focuses on locking expected behavior with deterministic unit coverage.

Test-Only Changes

1. Added test/extension/deviceStatusIndicator.test.ts

• validates text format and tooltip content on show()
• validates show() and hide() invocation behavior
• validates singleton lifecycle (reuse and dispose() cleanup)

2. Added test/extension/packagerStatusIndicator.test.ts

• validates port rendering with PACKAGER_STARTED in full/short display modes
• validates no-port behavior when port is omitted
• validates port reset after PACKAGER_STOPPED
• validates port retention across status transitions
• validates port replacement when updated

Non-Goals

• no production feature logic changes in this PR
• no smoke/e2e scope expansion in this PR

Validation

• test assertions rely on stubs for VS Code status bar APIs
• coverage targets status text, tooltip, visibility calls, and port transition correctness

[ConnorQi01]

/azp run

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