Only parent account should deploy the hosted zone, since hosted zone is unique

[avishayil]

Describe the bug
When deploying costBuddy, the route53 records configuration doesn't skip child accounts.
Since the hosted zone is unique, it should reside on the parent account and the records shouldn't deploy on child accounts.

To Reproduce
Steps to reproduce the behavior. For example:

1. Deploy costBuddy on parent account with route53 configuration
2. Change profile to child account, and terraform deploy using the same configuration
3. It will fail due to hosted zone doesn't exist on the child account

Expected behavior
Only parent account should deploy the hosted zone, so child accounts should skip this part