[CI Visibility] (innovation week) junitxml custom tags with xpath

[AdrianLC]

What and why?

Adding a new CLI flag to junit upload command to customize how tags are added to tests.

How?

A brief description of implementation details of this PR.

Review checklist

• [ ] Feature or bugfix MUST have appropriate tests (unit, integration)

[datadog-datadog-prod-us1[bot]]

Datadog Report

Branch report: adrian.lopezcalvo/innovation-junitxml-xpath Commit report: 90d714d

:white_check_mark: datadog-ci-tests 0 Failed, 0 New Flaky, 1213 Passed, 0 Skipped, 49.1s Wall Time