Fix our perimeter target group alarms so that we receive alerts when they are actaully unhealthy

[prabhukiran9999]

Describe the Issue

• Right now the health check for the target groups created in the perimeter account is setup at path / which is causing the alarm to trigger even if the actual client application is having a problem.
• Right now the target group setup is done with the dynamodb table entry and we want to see if it is possible to add a health checker path to that configuration
• If that's possible we need to update the target group configuration in the DNS layer terraform module to include that and test it out Additional Context Add any other context, attachments or screenshots

Acceptance Criteria

• SPIKE work done to see if adding a health check path is supported
• Add the configuration if that is supported