Test-21835: performance, correctness, and reporting cleanups for emergency access account check required

[sandeepjha000]

issues:

• Duplicate authentication methods rendered in Emergency access accounts table
• O(n²) role lookups in CA policy loop
• No short-circuit when there are zero enabled CA policies
• memberOf is non-transitive for directory roles
  users/{id}/memberOf/microsoft.graph.directoryRole only returns directly assigned roles. Users effectively assigned roles via role-assignable groups are missed, making CA includeRoles/excludeRoles evaluation (and the new "CA policies missing exclusion" column) inaccurate. Switch to transitiveMemberOf/microsoft.graph.directoryRole --> to be tracked separately in issue Test-21835: switch query to transitiveMemberOf/microsoft.graph.directoryRole ? #1250
• Sort-Object -Property CAExcluded, PhishingResistant, CloudOnly sorts on emoji glyphs.
  Pre-existing, not introduced here, but the comment "users that have passed every criteria first" is true only because U+2705 (✅) < U+274C (❌) in code-point order and PowerShell's culture-sensitive default happens to agree on Windows. Brittle. Consider sorting by booleans stored alongside the row, but out of scope for this PR.
• Status thresholds disagree with the spec.
  $accountCount -ge 2 -and $accountCount -le 4 → Pass, > 4 → Fail. Spec says == 2 → Pass, > 2 → Investigate, < 2 → Fail, and the test currently has no Investigate path. Pre-existing — out of scope for this PR but worth a follow-up.
  Some of these issues were reported in PR review comments: bugfix/issue-1162: list CA policies missing exclusions #1182