fix(workflow): respect contract name from schema v2

[Piskoo]

When running attestation init with a contract in schema v2, the contract is now created with the name defined in metadata.name instead of the default one.

piVersion: chainloop.dev/v1
kind: Contract
metadata:
  name: different-name
  description: Contract for CSAF advisories and VEX
spec:
  materials:
    # Refs: https://docs.oasis-open.org/csaf/csaf/v2.0/os/csaf-v2.0-os.html#45-profile-5-vex
    - type: CSAF_VEX
      name: vex-disclosure
    # Refs: https://docs.oasis-open.org/csaf/csaf/v2.0/os/csaf-v2.0-os.html#43-profile-3-informational-advisory
    - type: CSAF_INFORMATIONAL_ADVISORY
      name: informational-advisory
    # Refs: https://docs.oasis-open.org/csaf/csaf/v2.0/os/csaf-v2.0-os.html#44-profile-4-security-advisory
    - type: CSAF_SECURITY_ADVISORY
      name: security-advisory
    # Refs: https://docs.oasis-open.org/csaf/csaf/v2.0/os/csaf-v2.0-os.html#42-profile-2-security-incident-response
    - type: CSAF_SECURITY_INCIDENT_RESPONSE
      name: security-incident-response

$ chainloop att init --project myproject --workflow respects-name --contract contract.yml
WRN API contacted in insecure mode
WRN User-attended mode detected. This is intended for local testing only. For CI/CD or automated workflows, please use an API token.
This command will run against the organization "myorg"
Please confirm to continue y/N
y
INF Attestation initialized! now you can check its status or add materials to it
┌───────────────────────────┬──────────────────────────────────────┐
│ Initialized At            │ 13 Feb 26 12:13 UTC                  │
├───────────────────────────┼──────────────────────────────────────┤
│ Attestation ID            │ be0c970c-b7cf-4a86-98c7-ef772c3cb590 │
│ Organization              │ myorg                                │
│ Name                      │ respects-name                        │
│ Project                   │ myproject                            │
│ Version                   │ v1.19.1+next (prerelease)            │
│ Contract                  │ different-name (revision 1)          │
│ Policy violation strategy │ ADVISORY                             │
└───────────────────────────┴──────────────────────────────────────┘
┌────────────────────────────────────────────┐
│ Materials                                  │
├──────────┬─────────────────────────────────┤
│ Name     │ informational-advisory          │
│ Type     │ CSAF_INFORMATIONAL_ADVISORY     │
│ Set      │ No                              │
│ Required │ Yes                             │
├──────────┼─────────────────────────────────┤
│ Name     │ security-advisory               │
│ Type     │ CSAF_SECURITY_ADVISORY          │
│ Set      │ No                              │
│ Required │ Yes                             │
├──────────┼─────────────────────────────────┤
│ Name     │ security-incident-response      │
│ Type     │ CSAF_SECURITY_INCIDENT_RESPONSE │
│ Set      │ No                              │
│ Required │ Yes                             │
├──────────┼─────────────────────────────────┤
│ Name     │ vex-disclosure                  │
│ Type     │ CSAF_VEX                        │
│ Set      │ No                              │
│ Required │ Yes                             │
└──────────┴─────────────────────────────────┘