fix(cli): add line break before first violation in multi-policy output

[jiparis]

Summary

• When a policy evaluation has multiple violations, the first violation was displayed inline with the policy name while subsequent ones were properly indented with \n - . This adds the same line break before the first violation for consistent formatting.
• Single-violation policies remain inline as before.

┌───────────────────────────┬───────────────────────────────────────────────┐
│ Initialized At            │ 20 Mar 26 17:31 UTC                           │
├───────────────────────────┼───────────────────────────────────────────────┤
│ Attestation ID            │ e5ad061e-deb3-4d2f-a180-701ebb7490ac          │
│ Organization              │ my-org                                        │
│ Name                      │ aiworkflow2                                   │
│ Project                   │ my-project                                    │
│ Version                   │ v1.83.0+next (prerelease)                     │
│ Contract                  │ chainloop-platform-pr-validation (revision 2) │
│ Policy violation strategy │ ENFORCED                                      │
│ Policies                  │ ------                                        │
│                           │ test (gate):                                  │
│                           │   - violation1                                │
│                           │   - violation2                                │
│                           │   - violation3                                │
└───────────────────────────┴───────────────────────────────────────────────┘

Closes #2898

[cubic-dev-ai]

No issues found across 1 file