[ci] Enabled changelog bot from openwisp-utils

[pushpitkamboj]

Checklist

• I have read the OpenWISP Contributing Guidelines.
• I have manually tested the changes proposed in this pull request.
• I have written new test cases for new code and/or updated existing tests for changes to existing code.
• I have updated the documentation.

Description of Changes

Added a changelog bot workflow to automatically update changelogs when PRs are approved.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: bef52a3d-305c-4a27-87c6-ac5b7174a33d

📥 Commits

Reviewing files that changed from the base of the PR and between cbe29cf and 6999fdf.

📒 Files selected for processing (2)

• .github/workflows/bot-changelog-runner.yml
• .github/workflows/bot-changelog-trigger.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/changelog_bot

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[coveralls]

coverage: 99.18%. remained the same — ci/changelog_bot into master