Log response body when failing to download http sources

[chris-smith-zocdoc]

Is your feature request related to a problem? Please describe.
Sometimes http_source sources are unreliable and may produce 5xx responses, or clients may configure the wrong credentials resulting in a 4xx response. Pants makes this difficult to troubleshoot right now because only the status code is logged under debug logger.

Describe the solution you'd like
In the event of a error response, log the complete response body

Additional context
Related to #21955 where S3 produces a detailed error response, but its not visible the pants output.

In the case of S3, it might look something like

<?xml version="1.0" encoding="UTF-8"?>
<Error><Code>AccessDenied</Code><Message>User: foo is not authorized to perform: s3:GetObject on resource: "arn::..." because no identity-based policy allows the s3:GetObject action</Message><RequestId>123</RequestId><HostId>456</HostId></Error>