E2e test for accessing secrets in CI pipeline

Shabini Rajadasrequested to merge
e2e-secrets-in-pipeline into master

This MR adds E2E tests for accessing secrets in CI/CD pipelines using GitLab Secrets Manager. These tests validate that:

  1. Secrets can be successfully accessed in CI jobs using the gitlab_secrets_manager keyword
  2. Non-existent secrets are properly handled with appropriate error messages

This ensures the end-to-end flow of creating secrets via the UI and consuming them in CI pipelines works correctly. Issue link: #569618

Edited by Shabini Rajadas

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