chore(previews): Add uninstallation hook

[ahuseyn]

Description

This pull request introduces an optional data cleanup feature for the HWP Previews WordPress plugin, allowing users to remove all plugin settings and data during uninstallation by setting a specific constant. Documentation has been updated to explain this process, and new tests and an uninstall script have been added to support and verify the feature.

Feature Addition: Data Cleanup on Uninstall

• Added support for optional removal of all plugin data and settings during uninstall by defining the HWP_PREVIEWS_UNINSTALL_PLUGIN constant. This is implemented in the new uninstall.php script, which also fires an action hook for extensibility.

Documentation Updates

• Updated README.md and docs/plugins/hwp-previews/index.md to include instructions for enabling data cleanup on uninstall and details about the new constant.

Testing

• Added UninstallTest.php to verify the existence of the uninstall script, ensure plugin options can be deleted, and confirm the uninstall action hook fires correctly.

Release Note

• Added a changeset file describing the patch and the new optional uninstall cleanup feature.

Related Issue

#223

Dependant PRs

Type of Change

• ✅ Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to change)
• 🧹 Code refactoring (no functional changes)
• 📄 Example update (no functional changes)
• 📝 Documentation update
• 🔍 Performance improvement
• 🧪 Test update

How Has This Been Tested?

Screenshots

Checklist

• I have read the CONTRIBUTING document
• My code follows the project's coding standards
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (if applicable)
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works (if applicable)
• Any dependent changes have been highlighted, merged or published

[changeset-bot]

🦋 Changeset detected

Latest commit: a120c89

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@wpengine/hwp-previews-wordpress-plugin	Patch

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[github-actions]

📦 Plugin Artifacts Ready!

Download from GitHub Actions run

Available plugins:

• ✅ hwp-previews.zip

See the "Artifacts" section at the bottom of the Actions run page

[colinmurphy]

LGTM ❤️