CI: Flaky E2E test fix

Oleg Yakovenkorequested to merge
41802-flaky-test-fixup into master

What does this MR do and why?

This MR tries to resolve the following flaky test issue: https://gitlab.com/gitlab-org/quality/test-failure-issues/-/work_items/41802

  • We use existing test helper Flow::Pipeline.wait_for_pipeline_creation_via_api with extended timeout;
  • We wait for the first env variable row before making expectations.

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Edited by Oleg Yakovenko

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