chore (ci): Use Svace base image

[himax1991]

Description

Use Svace base image instead of building own.

Why do we need it, and what problem does it solve?

This approach brings unification and relieves from unnecessary additional builds and simplifies svace image maintenance.

What is the expected result?

The same svace build as it was, but without extra build steps and variables initializations.

Checklist

• The code is covered by unit tests.
• e2e tests passed.
• Documentation updated according to the changes.
• Changes were tested in the Kubernetes cluster manually.

Changelog entries

section: ci
type: chore
summary: Use Svace base image