PULL_REQUEST_TEMPLATE.md

### Description

This PR...
<!--- Describe your changes in DETAIL - And how has behaviour functionally changed. -->

<!-- For new features, provide link to FS, dev ML discussion etc. -->
<!-- In case of bug fix, the expected and actual behaviours, steps to reproduce. -->

<!-- When "Fixes: #<id>" is specified, the issue/PR will automatically be closed when this PR gets merged -->
<!-- For addressing multiple issues/PRs, use multiple "Fixes: #<id>" -->
<!-- Fixes: # -->

<!--- ******************************************************************************* -->
<!--- NOTE: AUTOMATION USES THE DESCRIPTIONS TO SET LABELS AND PRODUCE DOCUMENTATION. -->
<!--- PLEASE PUT AN 'X' in only **ONE** box -->
<!--- ******************************************************************************* -->

### Types of changes

- [ ] Breaking change (fix or feature that would cause existing functionality to change)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] Enhancement (improves an existing feature and functionality)
- [ ] Cleanup (Code refactoring and cleanup, that may add test cases)
- [ ] Build/CI
- [ ] Test (unit or integration test code)

### Feature/Enhancement Scale or Bug Severity

#### Feature/Enhancement Scale

- [ ] Major
- [ ] Minor

#### Bug Severity

- [ ] BLOCKER
- [ ] Critical
- [ ] Major
- [ ] Minor
- [ ] Trivial

### Screenshots (if appropriate):

### How Has This Been Tested?

<!-- Please describe in detail how you tested your changes. -->
<!-- Include details of your testing environment, and the tests you ran to -->

#### How did you try to break this feature and the system with this change?

<!-- see how your change affects other areas of the code, etc. -->

<!-- Please read the [CONTRIBUTING](https://github.com/apache/cloudstack/blob/main/CONTRIBUTING.md) document -->