Update pipeline failed notification emails to refer to jobs

What does this MR do?

The current pipeline failed notification emails refer to failures of builds. This is confusing to some users who assume their pipeline failed because of a problem with the 'build' job when really it could be any job that failed.

Fix this by updating the email text to correctly refer to the failures being those of jobs, not builds.

Screenshots (strongly suggested)

Before	After

Does this MR meet the acceptance criteria?

Conformity

• [Y] I have included a changelog entry, or it's not needed. (Does this MR need a changelog?)
• [Y] I have properly separated EE content from FOSS, or this MR is FOSS only. (Where should EE code go?)
• [Y] I have self-reviewed this MR per code review guidelines.
• [Y] This MR does not harm performance, or I have asked a reviewer to help assess the performance impact. (Merge request performance guidelines)
• [Y] I have followed the style guides.

Availability and Testing

• N/A

Security

• [Y] The MR includes necessary changes to maintain consistency between UI, API, email, or other methods