Draft: Align our breadcrumb with Pajama's Breadcrumb component

What does this MR do?

Aligns our breadcrumb with Pajama's Breadcrumb component.

Also tackles some CSS code.

Blocked by !48288 (merged)

Screenshots (strongly suggested)

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Separation of EE specific content

Closes #285087 (closed)