Update dynamic UI sample - according to the new format

New top-level attributes are Version, Templates and Application (while
unitTemplates is dropped), forms -> Forms.

Also, thanks to the commit https://review.openstack.org/#/c/86377/ it
is no longer necessary to explicitly specify YAQL expressions in
dynamic UI - now YAQL expressions are parsed automatically during YAML
parsing.

Another dependency is the https://review.openstack.org/#/c/86883/
commit which simplifies `repeat` function.

Change-Id: I2f3ce3121616749bd653e18b965d5c011a2894f1
Merge "Update dynamic UI sample - according to the new format"