feat: Update vscode extension to use auth provider

• Part 1 (GitLab Workflow extension): refactor: Move DefaultApiClient out of GitLabSe... (gitlab-vscode-extension!1418 - merged)
• Part 2 (GitLab Workflow extension): feat(web-ide): Use auth provider if available (gitlab-vscode-extension!1426 - merged)
• Part 3: feat: Update vscode extension to use auth provider (!288 - merged)
• Related MR's:
  • fix: Add setupAutoRefresh in oauth-client (!290 - merged)

Description

• Also updates interop interfaces