Migrates CI configuration to use 'dart format'

[mvanbeusekom]

✨ What kind of change does this PR introduce? (Bug fix, feature, docs update...)

Bug fix

⤵️ What is the current behavior?

Current CI configuration uses the flutter format command which has been deprecated by Google causing the builds to fail.

🆕 What is the new behavior (if this is a feature change)?

Updates the configuration to use the dart format instead as recommended by the Google Flutter team.

Note: this PR also adds a the new no-response.yaml workflow which will automatically close issues with the "status: needs more info" label after 14 days.

💥 Does this PR introduce a breaking change?

No

🐛 Recommendations for testing

CI build should now pass the formatting step.

📝 Links to relevant issues/docs

Resolves #152

🤔 Checklist before submitting

• I made sure all projects build.
• I updated pubspec.yaml with an appropriate new version according to the pub versioning philosophy.
• I updated CHANGELOG.md to add a description of the change.
• I followed the style guide lines (code style guide).
• I updated the relevant documentation.
• I rebased onto current main.

[JeroenWeener]

LGTM, bar some small nits