Changed utilites imports from ~ to relative paths

What does this MR do?

Changes the use of ~ to relative paths in the mr_widget_memory_usage component

Why was this MR needed?

To make sure our code respects our own docs

https://docs.gitlab.com/ce/development/fe_guide/style_guide_js.html#modules-imports-and-exports

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Tests
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

closes #33485 (closed)