refactor(tests): allow to setup the Datadog host URL

[sdenef-adeo]

For local tests purposes, we may want to update the Datadog host URL used for Datadog API requests.

Example: testing rate limiting
Running a local NginX server acting as a Datadog API mock. We can set a dedicated rate-limit config without burning our Datadog instance (called "organization" by Datadog) quota.

Reminder: https://docs.datadoghq.com/api/latest/rate-limits/

[lvaylet]

Hi @sdenef-adeo, I understand the rationale behind this request. This being said, I do not understand how the Datadog client will be able to use the host defined in these environment variables. Unlike DATADOG_API_KEY and DATADOG_APP_KEY, there is no mention of DATADOG_HOST in the package documentation on PyPi.

[sdenef-adeo]

Sorry, I made a typo, then I updated the PR.

It's api_host then the client will initialize accordingly.
cf https://datadogpy.readthedocs.io/en/latest/#datadog.initialize

Also part of docs/provides/datadog.md

Optional arguments to configure Datadog are documented in the Datadog initialize method here. You can pass them in the backend section, such as specifying api_host: api.datadoghq.eu in order to use the EU site.

[lvaylet]

Got it. Just a tiny change and we can merge.

[sdenef-adeo]

DATADOG_HOST renamed to DATADOG_API_HOST
And rebase on the last commit from main branch

[lvaylet]

Thanks @sdenef-adeo. Let me take care of the new vulnerabilities reported by safety and let's merge.

[lvaylet]

The new vulnerability reported by safety check was handled in #397. I will move forward and merge this PR.