refactor(pii): replace hash/mask baseline matchers with fake, static and nullify

[rokde]

Summary

• Replace the hash/mask defaults in `PiiMatcherBaselineProvider` with `fake`, `static` and `nullify` strategies — better GDPR hygiene and clearer intent for out-of-the-box matchers.
• Update `matchers:check` feature test expectations to reflect the new baseline output.

Test plan

• `composer test` green
• `clonio matchers:check` on a fresh project shows the new baseline strategies
• Spot-check a few sensitive column samples (email, phone, names) — output uses fake / static / nullify, not hash or mask

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