Avoid loading pipeline status in project search

What does this MR do?

When loading elasticsearch project search results we load the CI latest pipeline status to show a small icon on the results (green check or red exclamation mark). This adds little value while making the search very expensive, so I'm proposing we remove it.

Currently there's a lot of projects that do not have a pipeline status in results anyways.

Current: (the green checkmark can also be a red X)

Proposed: (note the lack of a green checkmark)

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ee/issues/9927

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer