Fix pipeline status layout in pipeline editor

What does this MR do?

This adds wrapping divs to the loading and error templates of the pipeline status component so the elements are grouped together under the flex layout.

Screenshots or Screencasts

Before	After

Loaded State

Error State

How to setup and validate locally

1. You can view the pipeline editor for the project in CI/CD > Editor.
2. To view the loading state, reload the page or create a new commit using the form at the bottom of the editor.

Does this MR meet the acceptance criteria?

Conformity

• I have included changelog trailers, or none are needed. (Does this MR need a changelog?)
• I have self-reviewed this MR per code review guidelines.
• This MR does not harm performance, or I have asked a reviewer to help assess the performance impact. (Merge request performance guidelines)
• I have followed the style guides.
• This change is backwards compatible across updates, or this does not apply.

Availability and Testing

• [-] I have added/updated tests following the Testing Guide, or it's not needed. (Consider all test levels. See the Test Planning Process.)