subsurface/.github/PULL_REQUEST_TEMPLATE.md

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### Describe the pull request:
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- [ ] Bug fix
- [ ] Functional change
- [ ] New feature
- [ ] Code cleanup
- [ ] Build system change
- [ ] Documentation change
- [ ] Language translation

### Pull request long description:
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### Changes made:
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### Related issues:
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### Additional information:
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### Release note:
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### Documentation change:
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<!-- Please, briefly outline here what has changed in terms of the user experience (UX). -->
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### Mentions:
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