Add non-comment lines specifying serialisation group

Author: smowton

go/ql/integration-tests/all-platforms/go/bazel-sample-1/force_sequential_test_execution

@@ -1 +1,2 @@
-# go get has been observed to sometimes fail when multiple tests try to simultaneously fetch the same package.
+# go get has been observed to sometimes fail when multiple tests try to simultaneously fetch the same package.
+goget

go/ql/integration-tests/all-platforms/go/bazel-sample-2/force_sequential_test_execution

@@ -1 +1,2 @@
-# go get has been observed to sometimes fail when multiple tests try to simultaneously fetch the same package.
+# go get has been observed to sometimes fail when multiple tests try to simultaneously fetch the same package.
+goget

go/ql/integration-tests/all-platforms/go/diagnostics/force_sequential_test_execution

@@ -1 +1,2 @@
-# go get has been observed to sometimes fail when multiple tests try to simultaneously fetch the same package.
+# go get has been observed to sometimes fail when multiple tests try to simultaneously fetch the same package.
+goget

go/ql/integration-tests/all-platforms/go/go-get-without-modules-sample/force_sequential_test_execution

@@ -1 +1,2 @@
-# go get has been observed to sometimes fail when multiple tests try to simultaneously fetch the same package.
+# go get has been observed to sometimes fail when multiple tests try to simultaneously fetch the same package.
+goget

go/ql/integration-tests/all-platforms/go/go-mod-sample/force_sequential_test_execution

@@ -1 +1,2 @@
-# go get has been observed to sometimes fail when multiple tests try to simultaneously fetch the same package.
+# go get has been observed to sometimes fail when multiple tests try to simultaneously fetch the same package.
+goget

go/ql/integration-tests/all-platforms/go/make-sample/force_sequential_test_execution

@@ -1 +1,2 @@
-# go get has been observed to sometimes fail when multiple tests try to simultaneously fetch the same package.
+# go get has been observed to sometimes fail when multiple tests try to simultaneously fetch the same package.
+goget

go/ql/integration-tests/all-platforms/go/ninja-sample/force_sequential_test_execution

@@ -1 +1,2 @@
-# go get has been observed to sometimes fail when multiple tests try to simultaneously fetch the same package.
+# go get has been observed to sometimes fail when multiple tests try to simultaneously fetch the same package.
+goget

go/ql/integration-tests/all-platforms/go/single-go-mod-and-go-files-not-under-it/force_sequential_test_execution

@@ -1 +1,2 @@
-# go get has been observed to sometimes fail when multiple tests try to simultaneously fetch the same package.
+# go get has been observed to sometimes fail when multiple tests try to simultaneously fetch the same package.
+goget

go/ql/integration-tests/all-platforms/go/single-go-mod-in-root/force_sequential_test_execution

@@ -1 +1,2 @@
-# go get has been observed to sometimes fail when multiple tests try to simultaneously fetch the same package.
+# go get has been observed to sometimes fail when multiple tests try to simultaneously fetch the same package.
+goget

go/ql/integration-tests/all-platforms/go/single-go-mod-not-in-root/force_sequential_test_execution

@@ -1 +1,2 @@
-# go get has been observed to sometimes fail when multiple tests try to simultaneously fetch the same package.
+# go get has been observed to sometimes fail when multiple tests try to simultaneously fetch the same package.
+goget