.github/pull_request_template.md

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Fixes #ISSUE_Number

### What does this PR do?
<!-- Brief overview of the changes, including any major features or fixes -->

### Type of Change
- [ ] Bug fix (non-breaking change)
- [ ] New feature (non-breaking change)
- [ ] Breaking change (fix or feature with breaking changes)
- [ ] Documentation update

### Breaking Changes
<!-- Remove if not applicable. If yes, explain impact and migration path -->

### Test Plan
<!-- How did you test these changes? -->
- [ ] Unit tests added/updated
- [ ] Integration tests added/updated
- [ ] Passed `make installcheck`
- [ ] Passed `make -C src/test installcheck-cbdb-parallel`

### Impact
<!-- Remove sections that don't apply -->
**Performance:**
<!-- Any performance implications? -->

**User-facing changes:**
<!-- Any changes visible to users? -->

**Dependencies:**
<!-- New dependencies or version changes? -->

### Checklist
- [ ] Followed [contribution guide](https://cloudberry.apache.org/contribute/code)
- [ ] Added/updated documentation
- [ ] Reviewed code for security implications
- [ ] Requested review from [cloudberry committers](https://github.com/orgs/apache/teams/cloudberry-committers)

### Additional Context
<!-- Any other information that would help reviewers? Remove if none -->

### CI Skip Instructions
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- Include the word "ci" and either "skip" or "no"
- Only use for documentation-only changes or when absolutely necessary
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