chore: Point CMB resources at new monorepo (#4106)

* chore: Point CMB resources at new monorepo

Author: EmandM

Tools/CI/service.cmb/README.md

@@ -1,6 +1,6 @@
 # Testing against the CMB Service
 
-The CMB Service is a tool that is external to our repository. The tool is inside the `runtime` folder in the [mps-common-multiplayer-backend](https://github.com/Unity-Technologies/mps-common-multiplayer-backend) repository.
+The CMB Service is a tool that is external to our repository. The tool is inside the `runtime` folder of the [CMB service](https://github.com/Unity-Technologies/unity-player-services/tree/main/services/common-multiplayer-backend) in the Unity Player Services monorepo.
 
 Due to this, there is some more setup needed when running tests against the CMB Service.
 
@@ -56,3 +56,7 @@ The following environment variables allow for further configuration of the setup
 `CMB_SERVICE_PORT` defines the port where the tests will try to connect to the service (defaults to `7789`).
 
 `NGO_HOST` defines the http address where the tests will try to connect to the service (defaults to `127.0.0.1`).
+
+## Running on CI (Yamato)
+
+The CMB tests can also be run from Yamato. The jobs are defined in [`.yamato/cmb-service-standalone-tests.yml`](../../../.yamato/cmb-service-standalone-tests.yml) and appear in Yamato as `CMB Service Test - NGO <project> - [<platform>, <editor>, <backend>]`. The job can be triggered manually from any branch meaning it can be easier to run the CMB tests from Yamato rather than set them up locally. The test uses [`run_cmb_service.sh`](./run_cmb_service.sh) to setup and run the CMB service.

Tools/CI/service.cmb/run_cmb_service.sh

@@ -17,7 +17,7 @@
   # Example usage:
     # ./<path-to-script>/run_cmb_service.sh -e 7788 -s 7799
 
-  # This script is currently used in the desktop-standalone-tests yamato job.
+  # This script is currently used in the cmb-service-standalone-tests yamato job (found at ../../../.yamato/cmb-service-standalone-tests.yml).
 
 # TECHNICAL CONSIDERATIONS---------------------------------------------------------------
   # This is a bash script and so needs to be run on a Unix based system.
@@ -136,11 +136,14 @@ else
 logMessage "Protocol Buffer Compiler Installed & ENV variables verified!\n PROTOC path is: $PROTOC"
 fi
 
-# clone the cmb service repo
-git clone https://github.com/Unity-Technologies/mps-common-multiplayer-backend.git
+# Sparse-checkout only the CMB service directory from the unity-player-services monorepo.
+# --filter=blob:none + --depth 1 avoids downloading file contents and history for the rest of the monorepo.
+git clone --depth 1 --filter=blob:none --sparse https://github.com/Unity-Technologies/unity-player-services.git
+cd ./unity-player-services
+git sparse-checkout set services/common-multiplayer-backend/runtime
 
 # navigate to the cmb service directory
-cd ./mps-common-multiplayer-backend/runtime
+cd ./services/common-multiplayer-backend/runtime
 
 # Install rust
 curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y