ci: Properly catch failed tests by introduction of workflow templates
pipeline passed: https://github.com/NVIDIA/NeMo/actions/runs/9382022367
# What does this PR do ?

We want to be notified about failed tests. However, as we send a "cancel" signal to all tests once a single test fails (including itself), no job will ever be marked with failure but with cancel instead. That's just a result due to the race-condition of cancelling workflows by our custom action.

We can only solve that issue by giving our test jobs an output that queries the result code of the main test step.

As we were discussing to refactor tests into a template anyway, I've addressed this refactoring 

**Collection**: [Note which collection this PR will affect]

# Changelog 
- Add specific line by line info of high level changes in this PR.

# Usage
* You can potentially add a usage example below

```python
# Add a code snippet demonstrating how to use this 
```

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# Before your PR is "Ready for review"
**Pre checks**:
- [ ] Make sure you read and followed [Contributor guidelines](https://github.com/NVIDIA/NeMo/blob/main/CONTRIBUTING.md)
- [ ] Did you write any new necessary tests?
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  - [ ] Reviewer: Does the PR have correct import guards for all optional libraries?
  
**PR Type**:
- [ ] New Feature
- [ ] Bugfix
- [ ] Documentation

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## Who can review?

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[Contributor guidelines](https://github.com/NVIDIA/NeMo/blob/main/CONTRIBUTING.md) contains specific people who can review PRs to various areas.

# Additional Information
* Related to # (issue)
