longhorn: upgrade from 1.9.0 to 1.12.0 (with intermediate releases)

Change-Id: Ice8f4e8f7e073023ab274c83154d9368525f9231
diff --git a/charts/longhorn-1.10.2/templates/NOTES.txt b/charts/longhorn-1.10.2/templates/NOTES.txt
new file mode 100644
index 0000000..cca7cd7
--- /dev/null
+++ b/charts/longhorn-1.10.2/templates/NOTES.txt
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+Longhorn is now installed on the cluster!
+
+Please wait a few minutes for other Longhorn components such as CSI deployments, Engine Images, and Instance Managers to be initialized.
+
+Visit our documentation at https://longhorn.io/docs/