Feature/cb2 11709 test: remove nested integration tests

[FurkanErdogan-BJSS]

Description

• Remove nested integration tests
• Move unit test execution to pre-commit
• Fix vulnerabilities
• Fix ci issues regarding package versions
• Remove --coverage from integration test execution in workflow to avoid heap memory issue
• Update jest configs to categorise unit and integration tests
• Add vscode jest settings to enable executing integration tests from vscode
• Add jest-serial-runner to allow sequential tests execution for integration tests

Related issue: 11709

Before submitting (or marking as "ready for review")

• Does the pull request title follow the conventional commit specification?
• Have you performed a self-review of the code
• Have you have added tests that prove the fix or feature is effective and working
• Did you make sure to update any documentation relating to this change?

[Nat-McCabe-BJSS]

Nice work, happy to approve once we look into the single line suggestion I made :)

[meys-bjss]

looks good to me

[naathanbrown]

Would be amazing to run these in the pipeline pre merge to make sure it's happy with the changes. https://github.com/dvsa/cvs-devops/actions -> this repo has all the actions needed to build a feature env and make sure that you're working. Think you just need to run the new-code-cut job

[FurkanErdogan-BJSS]

Would be amazing to run these in the pipeline pre merge to make sure it's happy with the changes. https://github.com/dvsa/cvs-devops/actions -> this repo has all the actions needed to build a feature env and make sure that you're working. Think you just need to run the new-code-cut job

Started this run: https://github.com/dvsa/cvs-devops/actions/runs/8878463350
not 100% sure if I did it correctly though.

[Nat-McCabe-BJSS]

Looks good, nice one!