PBB-32 Fix suffix addition in FNG pipeline
Due to an issue in GitLab where escaped variables are not correctly passed to child pipelines, a workaround is required. As a result, we use raw variables. The DEFERRED_RELEASE_VERSION variable was introduced for this purpose. However, for custom builds, we have an additional place where we modify the DEFERRED_RELEASE_VERSION variable to add a suffix. Therefore, extra interim variables need to be added to handle the workaround and ensure we get the raw variable in the end.
This is the second MR is addition to the MR into gitlab-ci