Fix "Http Error" when running test reporter action on forked repo

[Miaaaim]

Error: HttpError: Resource not accessible by integration

see here

Workflows triggered by pull requests from forked repositories are executed with read-only token and therefore can't create check runs. To workaround this security restriction, it's required to use two separate workflows:

CI runs in the context of the PR head branch with the read-only token. It executes the tests and uploads test results as a build artifact
Test Report runs in the context of the repository main branch with read/write token. It will download test results and create reports

The second workflow will only run after it has been merged into your default branch (typically main or master), it won't run in a PR unless after the workflow file is part of that branch.

[FriesI23]

Done