Publish test results for fork PRs #4336
                
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What type of PR is this?
Purely CI
What this PR does / why we need it:
Test results of pull requests from fork repositories are currently not published. The current setup makes them fail:
https://github.com/armadaproject/armada/actions/runs/14449584216/job/40518701460#step:5:2282
This is because the CI is executed in the context of the fork repository, where Github Actions does not have permissions to write to the upstream pull request (required by the publish action).
Which issue(s) this PR fixes:
This applies the pattern documented at https://github.com/mikepenz/action-junit-report#pr-run-permissions.