(#7656) Rename contact to make_http_request

Before this patch, the repository module used method names such as
contact to refer the action of making an http request, and
read_contact to refer to the action of reading an http response. This
caused readability issues.

This patch fixes these issues by renaming the following methods:

• contact -> make_http_request
• read_contact -> read_response

This patch also updates the related unit tests to reflect the new names
of these methods.