[monorepo] avoid corepack network requests (#33502)

* [monorepo] avoid corepack network requests

- Download yarn via corepack as the first step in all the docker files
- Turn off networking in corepack
- Do not run things in the upstream node image
  Instead, use the monorepo image, or base layer in all the services.
- Always build the base layer when running tests (uses cache)

* [monorepo] install corepack in shared place

* [clsi-lb] remove unrelated changes

* [web] add missing DC_RUN_FLAGS

* [monorepo] only rebuild test images locally

Also remove spurious build config in docker-compose.ci.yml.

* [server-ce] test: make yarn files available to host-admin and e2e

* [monorepo] put the corepack install snippet in a few more places

GitOrigin-RevId: 38005016ae5a708e12295e246269d6c18fece937

server-ce/test/docker-compose.yml

@@ -80,6 +80,10 @@ services:
       - $PWD:$PWD
       - $MONOREPO/libraries:$MONOREPO/libraries:ro
       - $MONOREPO/node_modules:$MONOREPO/node_modules:ro
+      - $MONOREPO/.yarn:$MONOREPO/.yarn:ro
+      - $MONOREPO/.yarnrc.yml:$MONOREPO/.yarnrc.yml:ro
+      - $MONOREPO/package.json:$MONOREPO/package.json:ro
+      - $MONOREPO/yarn.lock:$MONOREPO/yarn.lock:ro
     environment:
       MONOREPO:
       CYPRESS_SHARD:
@@ -110,6 +114,10 @@ services:
       - $PWD:$PWD
       - $MONOREPO/libraries:$MONOREPO/libraries:ro
       - $MONOREPO/node_modules:$MONOREPO/node_modules:ro
+      - $MONOREPO/.yarn:$MONOREPO/.yarn:ro
+      - $MONOREPO/.yarnrc.yml:$MONOREPO/.yarnrc.yml:ro
+      - $MONOREPO/package.json:$MONOREPO/package.json:ro
+      - $MONOREPO/yarn.lock:$MONOREPO/yarn.lock:ro
       - /var/run/docker.sock:/var/run/docker.sock
     stop_grace_period: 0s
     environment: