ignore genesis accounts in berkeley_migration_verifier

[ghost-not-in-the-shell]

Explain your changes:
This PR fixes berkeley_migration_verifier so that it ignores genesis accounts in genesis block

Explain how you tested your changes:
*

Checklist:

• Dependency versions are unchanged
  • Notify Velocity team if dependencies must change in CI
• Modified the current draft of release notes with details on what is completed or incomplete within this project
• Document code purpose, how to use it
  • Mention expected invariants, implicit constraints
• Tests were added for the new behavior
  • Document test purpose, significance of failures
  • Test names should reflect their purpose
• All tests pass (CI will check this if you didn't)
• Serialized types are in stable-versioned modules
• Does this close issues? List them

• Closes #0000

[ghost-not-in-the-shell]

!ci-build-me

[deepthiskumar]

!approved-for-mainnet

[emberian]

!ci-build-me

[deepthiskumar]

!approved-for-mainnet