Further improvements for meta-dts CIs with tests

[DaniilKl]

The problem you're addressing (if any)

No response

Describe the solution you'd like

1. • Integrate changes from issue Further improvements of DTS E2E tests open-source-firmware-validation#651.
2. • Make test results available publicly.
3. • Make tests fails easier to debug.

Where is the value to a user, and who might that user be?

1. Tests will be more effective and trustworthy.
2. Easier test results checking and discussion.
3. Easier test results debugging.

Describe alternatives you've considered

No response

Additional context

Make test results available publicly

At the moment of writing this issue the only way to access meta-dts tests logs is to download them from our private station. This is not convenient (requires some steps to be done) and is still prone to sharing secrets (when smbd wants to discuss tests results, he may unconsciously copy the results without hiding secrets). Maybe there is a way to make test results available without showing the secrets?

Make tests fails easier to debug

Check this PR for example Dasharo/meta-dts#219. The current output from the tests is not always enough to easily debug problems. Maybe, as a temporary solution, logs from DTS could be copied to our private station as well?