Add default .ocm/branch-info.yaml file (#631)

* Add default `.ocm/branch-info.yaml` file

* Update branch info

---------

Co-authored-by: Aleksandar Savchev <[email protected]>

Author: 8R0WNI3

.ocm/branch-info.yaml

@@ -0,0 +1,9 @@
+# SPDX-FileCopyrightText: 2025 SAP SE or an SAP affiliate company and Gardener contributors
+#
+# SPDX-License-Identifier: Apache-2.0
+
+release-branch-template: release-v$major.$minor # e.g. release-v1.0
+branch-policy:
+  significant-part: minor # major, minor, patch
+  supported-versions-count: 1
+  release-cadence: null # d (days), w (weeks), y | yr (years)