Improve svg import method in pipeline schedules

What does this MR do and why?

Part of #394859

Improve .svg import method in pipeline schedules

This change improves the way we import the empty state illustrations in the pipeline schedules.

Screenshots or screen recordings

No visual difference is expected:

Before	After

How to set up and validate locally

1. In rails console enable the experiment fully

   Feature.enable(:pipeline_schedules_vue)

2. Visit any project's (with no schedules) pipeline schedules page e.g. http://gdk.test:3000/flightjs/Flight/-/pipeline_schedules

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.