fix(integ-tests): httpApiCall.expect with resolved URL

[nmussy]

Issue # (if applicable)

Closes #29700

I've also opened #29701 to catch similar issues at synth time in the future

Reason for this change

When running httpApiCall('url').expect, the AssertionResults output logical ID would be overridden with an invalid name, containing the URL slashes.

This issue was not noticed earlier because, as far as I can tell, assertions were only made with Token/Ref URLs, e.g. apigw.DomainName

Description of changes

• Remove non-alphanumeric characters from the overridden AssertionResults output logical ID
• I've also added a bit of documentation to ExpectedResult, I noticed it was slightly lacking while creating the integration test

Description of how you validated changes

I've added unit and integration tests. The integration tests include both tests with API Gateway, to cover unresolved URLs, and to https://httpbin.org/ to test this fix

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 89d9a6f
• Result: SUCCEEDED
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