feat: show vault information in results

[kash-jay]

Context

Showing the vault information when a detected secret is found in a vault.

PR check list

• As much as possible, the changes include tests
• If the changes affect the end user (new feature, behavior change, bug fix) then the PR has a changelog entry.

---

Note

Adds vault details to diagnostics when a secret is vaulted, updating types, parser, tests, and utilities.

• Results Parsing:
  • Show vault information in diagnostic message: type, name, path, and count (with pluralization) when incident.secret_vaulted is true; otherwise show NO.
  • Replace previous single-line "Secret in Secrets Manager" with a multi-line vaultInfo block.
• Types:
  • Change Incident to a discriminated union adding vaulted properties: vault_type, vault_name, vault_path, vault_path_count when secret_vaulted: true.
• Tests:
  • Add scanResultsVaulted fixture and new test asserting vault details.
  • Update existing assertion to expect "Secret found in vault: NO".
• Utils:
  • Add pluralize(num, word) helper and use it for vault locations.

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[sevbch]

LGTM!

[sevbch]

Hi @GabrielCousin, it's be great to have a front-end review 👀 on this PR from you! 🙏