Fix tab navigation active state persistence

[roncodes]

Summary

• Preserve uncontrolled TabNavigation active state when refreshed tab arrays contain the current id
• Fall back to the first tab only when the active id is removed
• Add regression tests for refreshed tabs and removed active tabs

Validation

• npx eslint addon/components/tab-navigation.js tests/integration/components/tab-navigation-test.js
• npx ember test --filter 'Integration | Component | tab-navigation' builds, then local Testem fails before browser execution because testem requires ESM-only execa@9.6.1