Delete unused cached state patch job (#7901)

.github/workflows/ci-unit-tests-docker.patch.yml

@@ -26,13 +26,6 @@ on:
       - '.github/workflows/sub-build-docker-image.yml'
 
 jobs:
-  # We don't patch the testnet job, because testnet isn't required to merge (it's too unstable)
-  get-available-disks:
-    name: Check if cached state disks exist for Mainnet / Check if cached state disks exist
-    runs-on: ubuntu-latest
-    steps:
-      - run: 'echo "No build required"'
-
   build:
     name: Build CI Docker / Build images
     runs-on: ubuntu-latest