Fix for GD logs from regions other than eu-west-1 not being shipped to splunk

Implements a fix to Event rule sending GD events to the Eventbus of the SECLOG account. Works for all regions.

What's Changed

• Release/1.5.9 by @silavjy in #198
• 201 gd logs from regions other thatn eu west 1 not being shipped to splunk by @silavjy in #202

Full Changelog: 1.5.9...1.5.10