fix(vm): set max embedded cloud-init block size (#1083)

Signed-off-by: Pavel Tishkov <pavel.tishkov@flant.com>

Author: fl64

crds/virtualmachines.yaml

@@ -74,6 +74,8 @@ spec:
 
                         [More information about `cloud-init` and configuration examples](https://cloudinit.readthedocs.io/en/latest/reference/examples.html).
                       type: string
+                      maxLength: 2048
+
                     userDataRef:
                       description: |
                         Link to an existing resource with the `cloud-init` scenario.