Use pipeline schedule callout SVG in @gitlab/svgs instead

What does this MR do?

Use pipeline schedule callout SVG in @gitlab/svgs instead of one in the repo.

While @gitlab/svgs ^1.168.0 is required, !42961 (merged) already upgraded so.

Screenshots

n/a

Does this MR meet the acceptance criteria?

Conformity

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

Closes #257876 (closed)