fix(attestation-result): Include material annotations to attestation results

[javirln]

This patch fixes the attestation result logic to include annotations from the attestation materials. Previously, although the annotations were present in the final attestation, they were not reflected in the attestation result, causing it to display NOT SET.

Before:

INF push completed
┌───────────────────────────┬─────────────────────────────────────────────────────────────────────────┐
│ Initialized At            │ 11 Apr 25 09:49 UTC                                                     │
├───────────────────────────┼─────────────────────────────────────────────────────────────────────────┤
│ Attestation ID            │ 4f177397-a8f8-4ca8-9ad8-82d141c8dd2c                                    │
│ Digest                    │ sha256:fffc6326efc1503972c36686c5f4a9ed587faab3ba05f08c86659b7363a99d7d │
│ Organization              │ testing                                                                 │
│ Name                      │ goreleaser                                                              │
│ Project                   │ core                                                                    │
│ Version                   │ 1.0 (prerelease)                                                        │
│ Contract                  │ core-goreleaser (revision 2)                                            │
│ Policy violation strategy │ ADVISORY                                                                │
└───────────────────────────┴─────────────────────────────────────────────────────────────────────────┘
┌───────────────────────────────────────────────────────────────────────────────────────┐
│ Materials                                                                             │
├─────────────┬─────────────────────────────────────────────────────────────────────────┤
│ Name        │ slsa-attestation                                                        │
│ Type        │ SLSA_PROVENANCE                                                         │
│ Set         │ Yes                                                                     │
│ Required    │ Yes                                                                     │
│ Value       │ chainloop-dev-chainloop-attestation-6231042.sigstore.json               │
│ Digest      │ sha256:dd80c34cadd25107f2b68f9bfd7acf0cc65d1c00ff1c4de52ae78610eb28a29f │
│ Annotations │ ------                                                                  │
│             │ github_attestation: [NOT SET]                                           │
└─────────────┴─────────────────────────────────────────────────────────────────────────┘

After:

INF push completed
┌───────────────────────────┬─────────────────────────────────────────────────────────────────────────┐
│ Initialized At            │ 11 Apr 25 09:43 UTC                                                     │
├───────────────────────────┼─────────────────────────────────────────────────────────────────────────┤
│ Attestation ID            │ fb120b3d-a014-48e2-98dc-144a58250b5d                                    │
│ Digest                    │ sha256:8297e6c3759290837a6b9d0b0e3cb15e465a8a25ddf8ccedf3bf83ed6d451ae2 │
│ Organization              │ testing                                                                 │
│ Name                      │ goreleaser                                                              │
│ Project                   │ core                                                                    │
│ Version                   │ 1.0 (prerelease)                                                        │
│ Contract                  │ core-goreleaser (revision 2)                                            │
│ Policy violation strategy │ ADVISORY                                                                │
└───────────────────────────┴─────────────────────────────────────────────────────────────────────────┘
┌───────────────────────────────────────────────────────────────────────────────────────┐
│ Materials                                                                             │
├─────────────┬─────────────────────────────────────────────────────────────────────────┤
│ Name        │ slsa-attestation                                                        │
│ Type        │ SLSA_PROVENANCE                                                         │
│ Set         │ Yes                                                                     │
│ Required    │ Yes                                                                     │
│ Value       │ chainloop-dev-chainloop-attestation-6231042.sigstore.json               │
│ Digest      │ sha256:dd80c34cadd25107f2b68f9bfd7acf0cc65d1c00ff1c4de52ae78610eb28a29f │
│ Annotations │ ------                                                                  │
│             │ github_attestation: https://example.com                                 │
└─────────────┴─────────────────────────────────────────────────────────────────────────┘