When there are multiple broken XML files in an assets bundle. During the
bundle processing, a template containing the parsing error message is
returned for each XML file that is broken.
Before this commit, each of the returned templates had the same name,
raising another error ("Template already exists in module").
Now, all the returned templates has unique names.
closesodoo/odoo#141568
Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>