Resolve "Flaky test - pipelines_spec.rb:327

What does this MR do and why?

Spec fixes to remove flakyness from pipeline spec.

Since it's only testing hours and minutes, not second anymore there shouldn't be a time difference to affect the spec

Screenshots or screen recordings

N/A spec changes

How to set up and validate locally

be rspec gitlab/spec/features/projects/pipelines/pipelines_spec.rb:311 should pass

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

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

Related to #403601 (closed)