Remove Test Reports step from workflow

[pjfanning]

Removed Test Reports step from timing-tests workflow.

Our timing tests plan is failing every night. https://github.com/apache/pekko/actions/workflows/timing-tests.yml

This action is now not allowed due to apache/infrastructure-actions#828

Can't find any of the replacements in this allowed list:
https://github.com/apache/infrastructure-actions/blob/main/actions.yml

I don't think this action adds much anyway. When the tests fail, I just look at the logs to find the stacktraces and test reports.

[raboof]

I don't think this action adds much anyway. When the tests fail, I just look at the logs to find the stacktraces and test reports.

I'd like seeing test failure details more easily in theory, but in practice I agree I haven't found much use for this particular step