docs: explain snapshot testing

[ematipico]

Changes

• It updates the CONTRIBUTING.md file to add better details on how to test specific test cases, and how to use snapshot testing
• It removes prettier and eslint in favour of Biome
• It updates the TS files to address formatting/linting issues
• It updates the CI workflow to use Biome action

Testing

The current CI should pass

Docs

N/A

[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: 13c4ea59aecfa811058061f6d7b8eb411f387a07

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