fix(internal/librarian/golang): update generator tests and ci (#5305)

To support these tests in the continuous integration environment, a new
step is added to the librarian workflow to install the Go generator
tools using the librarian CLI. This ensures that the necessary binaries
are available for the generation process during test execution.

The generator tests in internal/librarian/golang are updated to use
consistent library names and expected paths. Before this change, this
test is not running in CI because the generator is not installed in CI.

Author: JoeWang1127

.github/workflows/librarian.yaml

@@ -49,6 +49,9 @@ jobs:
     steps:
       - uses: actions/checkout@v6
       - uses: ./.github/actions/setup-librarian
+      - name: Install tools
+        run: |
+          go run ./cmd/librarian install go
       - name: Run tests and check coverage
         run: |
           go run ./tool/cmd/coverage \

internal/librarian/golang/generate_test.go

@@ -392,9 +392,9 @@ func TestGenerateLibrary(t *testing.T) {
 			},
 		},
 		{
-			name: "multi api",
+			name: "multiple apis",
 			library: &config.Library{
-				Name: "secretmanager-multi",
+				Name: "secretmanager",
 				APIs: []*config.API{
 					{Path: "google/cloud/secretmanager/v1"},
 					{Path: "google/cloud/secretmanager/v1beta2"},
@@ -403,26 +403,26 @@ func TestGenerateLibrary(t *testing.T) {
 					GoAPIs: []*config.GoAPI{
 						{
 							ClientPackage: "secretmanager",
-							ImportPath:    "secretmanager-multi/apiv1",
+							ImportPath:    "secretmanager/apiv1",
 							Path:          "google/cloud/secretmanager/v1",
 						},
 						{
 							ClientPackage: "secretmanager",
-							ImportPath:    "secretmanager-multi/apiv1beta2",
+							ImportPath:    "secretmanager/apiv1beta2",
 							Path:          "google/cloud/secretmanager/v1beta2",
 						},
 					},
 				},
 			},
 			want: []string{
-				"secretmanager-multi/apiv1/secret_manager_client.go",
-				"secretmanager-multi/apiv1/secretmanagerpb/service.pb.go",
-				"secretmanager-multi/apiv1/version.go",
-				"secretmanager-multi/apiv1beta2/secret_manager_client.go",
-				"secretmanager-multi/apiv1beta2/secretmanagerpb/service.pb.go",
-				"secretmanager-multi/apiv1beta2/version.go",
-				"secretmanager-multi/internal/version.go",
-				"secretmanager-multi/README.md",
+				"secretmanager/apiv1/secret_manager_client.go",
+				"secretmanager/apiv1/secretmanagerpb/service.pb.go",
+				"secretmanager/apiv1/version.go",
+				"secretmanager/apiv1beta2/secret_manager_client.go",
+				"secretmanager/apiv1beta2/secretmanagerpb/service.pb.go",
+				"secretmanager/apiv1beta2/version.go",
+				"secretmanager/internal/version.go",
+				"secretmanager/README.md",
 			},
 		},
 		{