- Correct retrieval of context_uuid in methods RemoveSlice and RemoveService

- Extended PrepareTestScenario to support multiple REST methods
- Updated unitary tests accordingly
- Renamed test_unitary to test_ietf_l2vpn
- Cosmetic changes in CI/CD pipeline
- Fixed Python dependency versions in requirements file

- Corrected unitary test for IETF L2VPNs
- Added required descriptors

- Fixing GitLab CI/CD pipeline

- Fixing GitLab CI/CD pipeline
- Updated script to manually launch IETF L2VPN test

- Fixing GitLab CI/CD pipeline
- Updated scripts to manually launch NBI tests

- Fixing GitLab CI/CD pipeline
- Updated scripts to manually launch NBI tests

- Unit test cosmetic cleanup

Merge branch 'feat/100-cttc-improve-nbi-unitary-tests-framework-and-integration-with-gitlab-ci-cd-pipeline' into 'develop'

Resolve "(CTTC) Improve NBI unitary tests framework and integration with GitLab CI/CD pipeline"

Closes #100

See merge request !186