Reword 'build' to 'pipeline' in todos

What does this MR do and why?

This MR rewords The build failed for to The pipeline failed in in the pipeline failure todos. This makes the message consistent with other pipeline-related messages because the word “build” is not a part of the UI anymore (referring to pipelines).

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Create a project
2. Set up CI/CD
3. Create an MR that makes the pipeline fail (e.g. exit 1)
4. Wait for the pipeline to fail
5. See the updated todo wording

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 #223042 (closed), #300420 (closed)