[ECS] [request]: support HTTPS App Protocol

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**Tell us about your request**
When setting up Service Connect you can optionally set a field for `appProtocol` in the task definition, https://docs.aws.amazon.com/AmazonECS/latest/developerguide/task_definition_parameters.html.

Valid protocol values are "HTTP", "HTTP2", and "GRPC". I would like to request the addition of support for "HTTPS" as an application protocol in AWS Service Connect.

**Which service(s) is this request for?**
ECS, Service Connect.

**Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?**
Currently, when using Service Connect, the available application protocols are limited to HTTP, HTTP2, and gRPC, with no support for HTTPS. As a result, applications that require HTTPS must implement workarounds, such as using load balancers to handle HTTPS traffic.

**Are you currently working around this issue?**
I am using load balancers to handle HTTPS traffic, which adds complexity and overhead to the deployment process.