Update the style and icon of the remove button on the Run Pipeline page

Summary

Enhancing usability by updating the icons on the removal button.

Definition of Done

• The functionality will stay the same as it's a pure design change. This button shows up when users start to add/remove the variables.
  • Replace the icon.
  • Update the variant to tertiary one (Storybook)
  • The distance from the form to the button should be 8px.

Details

We are currently using the clear icon, we could update it to the remove icon with the new tertiary variant.

Current screenshot

• SVG icon: https://gitlab-org.gitlab.io/gitlab-svgs/?q=~remove

Design spec

• Figma dev 🔗
• Design tab 👉

Roles involved

• Design
• Technical Writing
• Backend
• Frontend
• Test engineering

NOTE: When work is ready to be defined, please create appropriate sub-tasks.