fix(http): append path to the url

[florentinl]

What does this PR do?

In case of an event that represents an HTTP request, the url is expected to contain the path and http.url_details.path should not be set because it is deduced by the backend at ingestion time and the value sent by the tracer is overwritten.

Motivation

I am trying to make Appsec API security work with lambda inside the tracer.

Testing Guidelines

Updating existing tests

Additional Notes

Types of Changes

• Bug fix
• New feature
• Breaking change
• Misc (docs, refactoring, dependency upgrade, etc.)

Check all that apply

• This PR's description is comprehensive
• This PR contains breaking changes that are documented in the description
• This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
• This PR impacts documentation, and it has been updated (or a ticket has been logged)
• This PR's changes are covered by the automated tests
• This PR collects user input/sensitive content into Datadog
• This PR passes the integration tests (ask a Datadog member to run the tests)