Refactor CI scripts and test fixes

[99Lys]

Summary

Refactoring CI scripts and fixing some tests.

Description

[CI Refactoring]

• Deleted create_dbt_test_users.sh → users are only needed for grants tests, which are not being ran in the current CI
• Created extract_auth_token.sh and updated create_and_format_sources.sh → split authentication token extraction from sources creation
• Updated create_env_file.sh → removed users and roles, as they are only needed for grants tests
• Display the exit status of each test/job → this gives us more visibility on what group of tests failed exactly, unfortunately the pipeline as a whole will be considered as "failed", but we only need to consider the results of Verify Expected Test Failures job
• Fixed erroring tests not being considered as failing tests → look for ERROR tests in artifacts as well, not only FAILED tests

[Tests Fixing]

• Grants → override apply_grants macro to include user: if no prefix is defined, otherwise any rerun of the same model will lead to revoking and regranting; override tests to include prefix in the expected results
• Hooks → add test prefix in dataset folder creation to avoid existing folder error

Test Results

• All tests are passing/failing as expected

Changelog

• Added a summary of what this PR accomplishes to CHANGELOG.md

[bcmeireles]

test

[valterfrancisco-dremio]

LGTM just have one question