Adds bastion_hosts j2 resource template

[tschwarz01]

Issue-id

PR Checklist

---

• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• [ X ] My code follows the code style of this project.
• I ran lint checks locally prior to submission.
• [ X ] Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Description

Adds j2 template for the bastion_hosts resource type

Does this introduce a breaking change

• YES
• [ X ] NO

Testing

bastion_hosts:
bastion_hub:
name: {{landingzone_definition}}{{env}}bastion001
region: region1
resource_group_key: sharedservices
vnet_key: vnet
subnet_key: bastion
public_ip_key: bastion_host