ci(mergify): Use mergify to check PR description

[Xuanwo]

Signed-off-by: Xuanwo github@xuanwo.io

I hereby agree to the terms of the CLA available at: https://databend.rs/dev/policies/cla/

Summary

Use mergify to check PR description

Changelog

• Build/Testing/CI

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1 Ignored Deployment

Name	Status	Preview	Updated
databend	⬜️ Ignored (Inspect)		Jun 28, 2022 at 5:06AM (UTC)

[mergify]

Thanks for the contribution!
I have applied any labels matching special text in your PR Changelog.

Please review the labels and make any necessary changes.

[Xuanwo]

Mergify config has been checked, let's merge this and have a try.

[mergify]

This pull request's description is not fulfill the requirements. @Xuanwo please update it 🙏.

The description should contain the following:

I hereby agree to the terms of the CLA available at: https://databend.rs/dev/policies/cla/

## Summary

  Summary about this PR

## Changelog

- New Feature
- Bug Fix
- Improvement
- Performance Improvement
- Build/Testing/CI
- Documentation
- Not for changelog (changelog entry is not required)

## Related Issues

Fixes #issue