Remove renamed .gitlab-ci variables (from pylama fixes)

Current Behavior

The following variables will be unused after merging #285 (closed) into master and all active pipelines using them have completed:

• twistlock_password
• twistlock_server_address
• twistlock_timeout
• twistlock_user
• vat_db_connection_pass
• vat_db_connection_user
• vat_db_database_name
• vat_db_host

Purpose

Plan

One week after the MR !578 (merged) is merged into master: For each variable:

• Search for each variable to verify it is not in use in the development branch
• Delete the variables from: https://repo1.dso.mil/groups/dsop/-/settings/ci_cd

Acceptance Criteria

The lower-case form of the above variables no longer exist in the code or the dsop CICD variables list.