Activate manually the test workflow

[mirkokurt]

Motivation

We don't have a simple way to trigger client tests, it's needed because many times happened that we weren't able to run automatic tests for many reasons (ex. GH trigger didn't start as expected)

Change description

• The workflow_dispatch GH action event has been added, this event is meant exactly to trigger a workflow manually

Additional Notes

https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#workflow_dispatch

Reviewer checklist

• [ ] PR address a single concern.
• [ ] PR title and description are properly filled.
• [ ] Changes will be merged in master.
• [ ] Changes are covered by tests.
• [ ] Logging is meaningful in case of troubleshooting.
• [ ] History is clean, commit messages are meaningful (see CONTRIBUTING.md) and are well formatted.
• [ ] Mentioned the Analytics team when there are schema changes.