Update pipeline_with_image_pull_policy_spec.rb error message

What does this MR do and why?

Describe in detail what your merge request does and why.

As per #371420 (closed)

Runner updated the Pull Policy error message ( gitlab-runner!3526 (diffs) ). This MR updates the test to reflect that.

Note: After much consideration we decided to go with the original proposal !95910 (comment 1076488056)

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How to set up and validate locally

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USE LATEST RUNNER!

CHROME_HEADLESS=false bundle exec bin/qa Test::Instance::All http://gdk.test:3000/ ./qa/specs/features/browser_ui/4_verify/pipeline/pipeline_with_image_pull_policy_spec.rb

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.