[IMP] l10n_gr: switch account.account.template creation in csv

data creation is faster when done through a CSV file than an XML file, hence doing it through a CSV

was task# 1909961

closes odoo/odoo#28886

addons/l10n_gr/__manifest__.py

@@ -21,6 +21,7 @@ Greek accounting chart and localization.
     ],
     'data': [ 'data/account_type_data.xml',
               'data/l10n_gr_chart_data.xml',
+              'data/account.account.template.csv',
               'data/account_chart_template_data.xml',
               'data/account_data.xml',
               'data/account_tax_data.xml',