vets-api helm chart - move dbMigrate to parent helm chart

[patrick-black-oddball]

The dbMigrate init container is consistent in all environment - move into parent helm chart

• allow for conditional

Tasks

• [ ] Add dbMigrate to parent helm chart - allow for override
• [ ] remove from dev helm chart
• [ ] remove from staging helm chart
• [ ] remove from production helm chart
• [ ] remove from sandbox helm chart

Acceptance Criteria

• [ ] DB Migrate running in all environment from parent helm chart