Fix: pipeline minigraph wrong offset issue

What does this MR do and why?

The current pipeline minigraph section is not horizontally aligned with each other because of the wrong padding gl-pt-2. This MR is meant to remove that CSS class and fix the issue.

/cc @prajnamas @orozot @qk44077907 @lxwan

Also /cc @bsandlin since you were the author of this.

Describe in detail what your merge request does and why.

Screenshots or screen recordings

Before	After

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

How to set up and validate locally

1. Go to any project with pipeline records
2. Go to any pipeline detail page by clicking pipeline item on the page.
3. Observe the minigraph section, you can easily tell the difference.

Numbered steps to set up and validate the change are strongly suggested.

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.