chore: add @io.grpc.stub.annotations.GrpcGenerated annotation (#261)

* changes without context

        autosynth cannot find the source of changes triggered by earlier changes in this
        repository, or by version upgrades to tools such as linters.

* chore(ruby): Re-enable bigquery-storage-v1 generation, which also required updating protobuf from 3.15.3 to 3.18.1 for codegen

PiperOrigin-RevId: 403132955

Source-Author: Google APIs <noreply@google.com>
Source-Date: Thu Oct 14 10:50:47 2021 -0700
Source-Repo: googleapis/googleapis
Source-Sha: d2977af9e9f1fc0c9dc8368352daa032471f3c63
Source-Link: googleapis/googleapis@d2977af

* docs: fix docstring formatting

Committer: @parthea
PiperOrigin-RevId: 404008092

Source-Author: Google APIs <noreply@google.com>
Source-Date: Mon Oct 18 11:08:45 2021 -0700
Source-Repo: googleapis/googleapis
Source-Sha: f5b58edfffe922e9837490336be8562f108e7b66
Source-Link: googleapis/googleapis@f5b58ed

* chore: update Java and Python dependencies

PiperOrigin-RevId: 408420890

Source-Author: Google APIs <noreply@google.com>
Source-Date: Mon Nov 8 13:03:45 2021 -0800
Source-Repo: googleapis/googleapis
Source-Sha: 2921f9fb3bfbd16f6b2da0104373e2b47a80a65e
Source-Link: googleapis/googleapis@2921f9f

Co-authored-by: Chanseok Oh <chanseok@google.com>

grpc-google-common-protos/src/main/java/com/google/longrunning/OperationsGrpc.java

@@ -34,6 +34,7 @@
 @javax.annotation.Generated(
     value = "by gRPC proto compiler",
     comments = "Source: google/longrunning/operations.proto")
+@io.grpc.stub.annotations.GrpcGenerated
 public final class OperationsGrpc {
 
   private OperationsGrpc() {}

synth.metadata

@@ -11,8 +11,8 @@
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "177c62af7f181a42b91def98dec2e46efdb07b5e",
-        "internalRef": "401879979"
+        "sha": "2921f9fb3bfbd16f6b2da0104373e2b47a80a65e",
+        "internalRef": "408420890"
       }
     },
     {