Merge pull request #39393 from ixdy/gazel-srcs

Automatic merge from submit-queue

bazel: update to gazel v13 and create sources rules throughout tree

**What this PR does / why we need it**: creates filegroup rules using https://github.com/mikedanese/gazel/pull/20, which we can then use in creating release tarballs

**Special notes for your reviewer**: this obviously should not be merged before https://github.com/mikedanese/gazel/pull/20 is merged and tagged; this is more to give you an idea of what the output looks like. The verification tests should fail this PR in any case.

**Release note**:

```release-note
NONE
```

pkg/cloudprovider/providers/openstack/BUILD

@@ -75,3 +75,16 @@ go_test(
         "//vendor:github.com/rackspace/gophercloud/openstack/compute/v2/servers",
     ],
 )
+
+filegroup(
+    name = "package-srcs",
+    srcs = glob(["**"]),
+    tags = ["automanaged"],
+    visibility = ["//visibility:private"],
+)
+
+filegroup(
+    name = "all-srcs",
+    srcs = [":package-srcs"],
+    tags = ["automanaged"],
+)