Create no-response.yml GitHub Action

[jeffpaul]

Description of the Change

This PR adds a GitHub Action that will auto-close issues with the reporter feedback label if there is no response from the original reporter within 14 days. If the original reporter responds after the 14 days, the issue will be auto-reopened. Anyone else is also able to reopen the issue, this PR just helps close stale issues automatically.

Alternate Designs

Manually maintain unresponded to issues and remember to close them.

Benefits

Automates closing of stale issues.

Possible Drawbacks

none identified

Verification Process

Already tested on ElasticPress and working well there.

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests passed.

Applicable Issues

n/a

Changelog Entry

### Added
- Issue management automation via GitHub Actions (props @jeffpaul).