Redo dotnet format (#5119)

.github/workflows/pre-commit.yml

     - uses: actions/setup-dotnet@v1
       with:
         dotnet-version: '3.1.x'
-    - run: dotnet tool install -g dotnet-format --version 4.1.131201
     - uses: pre-commit/action@v2.0.0
 
   markdown-link-check:

.pre-commit-config.yaml

     types: [markdown]
     exclude: ".*localized.*"
 
+- repo: https://github.com/dotnet/format
+  rev: "7e343070a0355c86f72bdee226b5e19ffcbac931"  # TODO - update to a tagged version when one that includes the hook is ready.
+  hooks:
+  - id: dotnet-format
+    args: [--folder, --include]
+
 # "Local" hooks, see https://pre-commit.com/#repository-local-hooks
 -   repo: local
     hooks:
         name: validate release links
         language: script
         entry: utils/validate_release_links.py
-

com.unity.ml-agents/Runtime/Communicator/GrpcExtensions.cs

         /// <returns>The protobuf version of the AgentInfo.</returns>
         public static AgentInfoProto ToAgentInfoProto(this AgentInfo ai)
         {
-            if(ai.groupId > 0)
+            if (ai.groupId > 0)
             {
                 var trainerCanHandle = Academy.Instance.TrainerCapabilities == null || Academy.Instance.TrainerCapabilities.MultiAgentGroups;
                 if (!trainerCanHandle)

utils/run_dotnet_format.py

-#!/usr/bin/env python3
-
-import argparse
-import os
-import subprocess
-import tempfile
-
-
-if __name__ == "__main__":
-
-    parser = argparse.ArgumentParser()
-    parser.add_argument("files", nargs="*")
-    args = parser.parse_args()
-
-    with tempfile.TemporaryDirectory() as tempdir:
-        # Could potentially hit the commandline limit, so write files to a response file
-        # See https://github.com/dotnet/format/issues/699
-        resp_file = os.path.join(tempdir, "response.txt")
-        with open(resp_file, "w") as fp:
-            for f in args.files:
-                fp.write(f + "\n")
-
-        subprocess_args = ["dotnet", "format", "--folder", "--include", f"@{resp_file}"]
-        subprocess.check_call(subprocess_args)