Handle github-copilot-identity category in frontend

[Copilot]

Fixes JAVASCRIPT-36ZJ

Backend introduced github-copilot-identity category (2026-02-05) but frontend enum only recognized 3 identity types, causing "Invalid category" errors on admin user pages.

Changes

• Added enum value: GITHUB_COPILOT_IDENTITY = 'github-copilot-identity' to UserIdentityCategory
• Updated identity label rendering: Added case in identityLabel() to display "GitHub Copilot"
• Updated sort order: Added new category to categoryRank() array for proper identity sorting in account settings
• Added test coverage: Created test suite for UserOverview component covering all identity categories

// Before: threw "Invalid category" error
function identityLabel(identity: UserIdentityConfig) {
  if (identity.category === UserIdentityCategory.GLOBAL_IDENTITY) {
    text = identity.isLogin ? 'Global Login' : 'App Integration';
  } else if (identity.category === UserIdentityCategory.SOCIAL_IDENTITY) {
    text = 'Legacy Integration';
  } else {
    throw new Error('Invalid category'); // ← Thrown for github-copilot-identity
  }
}

// After: handles all categories including GitHub Copilot
function identityLabel(identity: UserIdentityConfig) {
  if (identity.category === UserIdentityCategory.GLOBAL_IDENTITY) {
    text = identity.isLogin ? 'Global Login' : 'App Integration';
  } else if (identity.category === UserIdentityCategory.SOCIAL_IDENTITY) {
    text = 'Legacy Integration';
  } else if (identity.category === UserIdentityCategory.GITHUB_COPILOT_IDENTITY) {
    text = 'GitHub Copilot';
  } else {
    throw new Error('Invalid category');
  }
}

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