chore(ci): Add linting for python; pin pydantic

[dmihalcik-virtru]

• pin pydantic to avoid flakes where pydantic 1.x is being installed
• While I'm here, run black (code formatter) and add black --check and ruff check (linter) to merge checks

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud