ci: 🎨 run prettier check for all PRs

[sestinj]

Description

To make sure we don't have noisy PRs due to formatting differences

Checklist

• I've read the contributing guide
• The relevant docs, if any, have been updated or created
• The relevant tests, if any, have been updated or created

Tests

N/A

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Summary by mrge

Added a Prettier formatting check to the CI workflow to catch code style issues in all PRs.

• Dependencies
  • Added format and format:check scripts to package.json for easier formatting.

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[tomasz-stefaniak]

We need to also fix all malformatted files before merging this.

[continue-code-review]

⚠️ Code review encountered an issue: AI code review failed: 400 {"type":"error","error":{"type":"invalid_request_error","message":"prompt is too long: 204667 tokens > 200000 maximum"}}

[continue-code-review]

⚠️ Code review encountered an issue: AI code review failed: 400 {"type":"error","error":{"type":"invalid_request_error","message":"prompt is too long: 209072 tokens > 200000 maximum"}}