Add validation in the latticeServiceModelBuildTask: the hostnames in the TLSRoute is required field for the aws gateway api controller supported TLSRoute

Due to the VPC lattice Considerations:

The VPC Lattice service must have a custom domain name.

For aws gateway api controller supported TLSRoute, it must have at least one item in the hostnames field.

Need to change code here:

Line 135 in 036e2a3

spec.CustomerDomainName = string(t.route.Spec().Hostnames()[0])

Provide feedback