polkadot-parachain: Remove shell node (#5911)

Removing the shell node variant for the polkadot-parachain as discussed
here:
#5586 (comment)

Resolves #5898

.github/workflows/check-cargo-check-runtimes.yml

@@ -85,25 +85,11 @@ jobs:
         with:
           root: cumulus/parachains/runtimes/contracts
 
-  check-runtime-starters:
-    runs-on: ${{ needs.preflight.outputs.RUNNER }}
-    container:
-      image: ${{ needs.preflight.outputs.IMAGE }}
-    needs: [check-runtime-assets, preflight]
-    timeout-minutes: 20
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-      - name: Run cargo check
-        uses: ./.github/actions/cargo-check-runtimes
-        with:
-          root: cumulus/parachains/runtimes/starters
-
   check-runtime-testing:
     runs-on: ${{ needs.preflight.outputs.RUNNER }}
     container:
       image: ${{ needs.preflight.outputs.IMAGE }}
-    needs: [check-runtime-starters, preflight]
+    needs: [preflight]
     timeout-minutes: 20
     steps:
       - name: Checkout

.gitlab/pipeline/build.yml

@@ -256,7 +256,7 @@ build-test-parachain:
 # DAG: build-runtime-assets -> build-runtime-collectives -> build-runtime-bridge-hubs
 # DAG: build-runtime-assets -> build-runtime-collectives -> build-runtime-contracts
 # DAG: build-runtime-assets -> build-runtime-coretime
-# DAG: build-runtime-assets -> build-runtime-starters -> build-runtime-testing
+# DAG: build-runtime-assets -> build-runtime-testing
 build-runtime-assets:
   <<: *build-runtime-template
   variables:
@@ -298,22 +298,13 @@ build-runtime-contracts:
     - job: build-runtime-collectives
       artifacts: false
 
-build-runtime-starters:
-  <<: *build-runtime-template
-  variables:
-    RUNTIME_PATH: "cumulus/parachains/runtimes/starters"
-  # this is an artificial job dependency, for pipeline optimization using GitLab's DAGs
-  needs:
-    - job: build-runtime-assets
-      artifacts: false
-
 build-runtime-testing:
   <<: *build-runtime-template
   variables:
     RUNTIME_PATH: "cumulus/parachains/runtimes/testing"
   # this is an artificial job dependency, for pipeline optimization using GitLab's DAGs
   needs:
-    - job: build-runtime-starters
+    - job: build-runtime-assets
       artifacts: false
 
 build-short-benchmark-cumulus:

Cargo.toml

@@ -130,8 +130,6 @@ members = [
 	"cumulus/parachains/runtimes/glutton/glutton-westend",
 	"cumulus/parachains/runtimes/people/people-rococo",
 	"cumulus/parachains/runtimes/people/people-westend",
-	"cumulus/parachains/runtimes/starters/seedling",
-	"cumulus/parachains/runtimes/starters/shell",
 	"cumulus/parachains/runtimes/test-utils",
 	"cumulus/parachains/runtimes/testing/penpal",
 	"cumulus/parachains/runtimes/testing/rococo-parachain",
@@ -1187,7 +1185,6 @@ schnorrkel = { version = "0.11.4", default-features = false }
 seccompiler = { version = "0.4.0" }
 secp256k1 = { version = "0.28.0", default-features = false }
 secrecy = { version = "0.8.0", default-features = false }
-seedling-runtime = { path = "cumulus/parachains/runtimes/starters/seedling" }
 separator = { version = "0.4.1" }
 serde = { version = "1.0.210", default-features = false }
 serde-big-array = { version = "0.3.2" }
@@ -1198,7 +1195,6 @@ serial_test = { version = "2.0.0" }
 sha1 = { version = "0.10.6" }
 sha2 = { version = "0.10.7", default-features = false }
 sha3 = { version = "0.10.0", default-features = false }
-shell-runtime = { path = "cumulus/parachains/runtimes/starters/shell" }
 shlex = { version = "1.3.0" }
 slot-range-helper = { path = "polkadot/runtime/common/slot_range_helper", default-features = false }
 slotmap = { version = "1.0" }