Chore: [AEA-0000] - align black to flake8 120 char line length

[tstephen-nhs]

Summary

• 🤖 Operational or Infrastructure Change

Details

• Although dev container tells vscode to use 120 char line length pre-commit was using the default putting black and flake8 in conflict. This change makes both use line length of 120.
• All files reformatted with the new settings

[github-actions]

This PR is linked to a ticket in an NHS Digital JIRA Project. Here's a handy link to the ticket:

AEA-0000

[sonarqubecloud]

Quality Gate passed

Issues
4 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 SonarQube Cloud