Support turning off HTTP to HTTPS redirects

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**Tell us about your request**
What do you want us to build?

I would like to be able to disable HTTP to HTTPS redirects.

**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features you've considered.

An alternative might be to set the response code as proposed here: https://github.com/aws/apprunner-roadmap/issues/231.

Another alternative may be to set up API Gateway or Lambdas for custom redirection, but that would incur additional complexity and cost.

**Additional context**
Anything else we should know?

I currently host an API that uses API keys in the header for authentication. This API is meant for non-browser web clients to consume. Therefore it makes more sense to fail fast when the HTTP protocol is used. This is because if the wrong protocol is used during testing, it can be corrected instead of failing silently and allowing the secret credentials to be leaked.

As mentioned in the reference below:

> Redirecting HTTP to HTTPS for APIs can be more harmful than helpful due to the nature of APIs. Unlike user-facing web pages, APIs are primarily consumed by other software. API clients often follow redirects automatically and do not maintain state or support security headers like HSTS. This can lead to silent failures where sensitive data in each API request is initially transmitted in plaintext over the network, unencrypted.

Reference: https://jviide.iki.fi/http-redirects

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Review the requested HTTP-to-HTTPS redirect behavior and the linked API Gateway/Lambda alternative. The issue does not name files, tests, or an implementation entry point; done would mean providing a supported way to disable the redirect and defining the response behavior when HTTP is used.

Written by the indexing model from the issue text.