Fix GitLab CI environment variables integration

[ArturT]

• Use CI_PIPELINE_ID as build ID for GitLab CI because it is unique across parallel jobs
• Load GitLab CI envs first to avoid edge case with an order of loading envs for CI_NODE_INDEX. Gitlab CI starts from 1 instead of index 0 for CI_NODE_INDEX. We should first check if CI is Gitlab CI then do CI_NODE_INDEX - 1. Otherwise, assume it's other CI provider and just use CI_NODE_INDEX.