Request Timout parity with other platforms and tools

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**Tell us about your request**
Please increase the maximum timeout of an HTTP request to AppRunner to be more inline with other platforms:
Lambda - 600 seconds
Elastic Beanstalk - Unlimited
Google Cloud Run - 60 minutes
Azure Container Instances: unlimited

There are many use cases for long lived http requests which do *not* fit will with an async pattern or with something like AWS batch.

**Describe alternatives you've considered**
These other platforms mentioned above.

**Additional context**
If you are trying to protect a resource like load balancer connections... then simply add it to the cost model and let us decide.

This is an AWS App Runner roadmap request to increase the maximum HTTP request timeout; no repository files, tests, or implementation entry points are named. Start by confirming the current limit and the service constraints, then discuss the requested parity with maintainers; done would require an accepted product change rather than a repository patch.

Written by the indexing model from the issue text.