Remove NAT gateway and ALB, including HTTPS support

[pcholakov]

This change simplifies the network topology and speeds up typical stack provisioning times by a factor of 2x. It also makes it substantially cheaper as it eliminates the ELB and NAT gateway charges, though it adds an Elastic IP address.

Total deployment time is down to about ~3min for the RestateStack (and unchanged at about 90s for the HolidayTripsServiceStack):

pt-ec2-RestateStack: deploying... [1/2]
pt-ec2-RestateStack: creating CloudFormation changeset...

 ✅  pt-ec2-RestateStack

✨  Deployment time: 184.66s

Outputs:
pt-ec2-RestateStack.ExportsOutputFnGetAttRestateHost1AC4F9D1PublicDnsName90BD9412 = ec2-3-70-234-107.eu-central-1.compute.amazonaws.com
pt-ec2-RestateStack.ExportsOutputFnGetAttRestateInstanceRoleACC59A6FArn348D1AD6 = arn:aws:iam::663487780041:role/pt-ec2-RestateStack-RestateInstanceRoleACC59A6F-7R0y3xFNbiqV
pt-ec2-RestateStack.ExportsOutputFnGetAttRestateRegistrationProviderframeworkonEventC2D8D44FArnB7A27897 = arn:aws:lambda:eu-central-1:663487780041:function:pt-ec2-RestateStack-RestateRegistrationProviderfra-10jMcCxLmJsF
pt-ec2-RestateStack.RestateHostInstanceId = i-0c592b072a3fabda5
pt-ec2-RestateStack.RestateIngressEndpoint = http://ec2-3-70-234-107.eu-central-1.compute.amazonaws.com:8080
pt-ec2-RestateStack.RestateRegistrationProviderToken6ED9A8E4 = arn:aws:lambda:eu-central-1:663487780041:function:pt-ec2-RestateStack-RestateRegistrationProviderfra-10jMcCxLmJsF
Stack ARN:
arn:aws:cloudformation:eu-central-1:663487780041:stack/pt-ec2-RestateStack/6e2421c0-92bd-11ee-90af-065b337bb103

✨  Total time: 190.65s