chore: refactor synthetic tests configuration

Description

Refactor synthetic tests configuration:

• install yq
• replace sed instructions to yq rules to make configuration more reliable

Related issue

Examples

Checklist

• the MR description has been reviewed
• this MR contains text changes and they have been reviewed OR there are no texts changes
• this MR contains GUI/CLI changes and they have been reviewed OR there are no GUI/CLI changes
• this MR contains API changes, specifications reflect those changes and they have been reviewed OR there are no API changes