Update obsolete badges in the readme

[vickenty]

What does this PR do?

Update broken obsolete badges in the readme.

Description of the Change

Alternate Designs

Possible Drawbacks

Verification Process

Additional Notes

Release Notes

Review checklist (to be filled by reviewers)

• Feature or bug fix MUST have appropriate tests (unit, integration, etc...)
• PR title must be written as a CHANGELOG entry (see why)
• Files changes must correspond to the primary purpose of the PR as described in the title (small unrelated changes should have their own PR)
• PR must have one changelog/ label attached. If applicable it should have the backward-incompatible label attached.
• PR should not have do-not-merge/ label attached.
• If Applicable, issue must have kind/ and severity/ labels attached at least.

[ofek]

[![CI - Test](https://github.com/DataDog/datadogpy/actions/workflows/test.yml/badge.svg)](https://github.com/DataDog/datadogpy/actions/workflows/test.yml)

[github-actions]

This issue has been automatically marked as stale because it has not had activity in the last 30 days.
Note that the issue will not be automatically closed, but this notification will remind us to investigate why there's been inactivity.