CI: Remove build for dual espresso again

The pipeline is not setup to build from different manifest and so on,
and the dual_espresso manifest will probably go to a seperate repo
to keep it private.

manifest.yml

@@ -290,15 +290,6 @@ build:imx8mpguf:
   variables:
     CI_PARAM_MACHINE: imx8mpguf
 
-build:imx8mpguf:dual-espresso:
-  extends: .buildimage
-  stage: build
-  rules:
-    - when: manual
-  variables:
-    CI_PARAM_MACHINE: imx8mpguf
-    CI_PARAM_IMAGE: seco-image-dual-espresso
-
 build:imx6guf:fngsystem:
   extends: .buildfng
   stage: build