First step to stream QWeb templates: removing the two post
processing operations applied on rendered templates. This
should slightly speed up the rendering of every page.
1/ Don't remove empty lines after rendering, but fix the root
cause of: view inheritancies and QWeb compilation that don't
add extra empty lines.
2/ handle page break in the two reports that uses it, rather
than processing every view produced.
closesodoo/odoo#82244
Related: odoo/enterprise#23328
Signed-off-by: Fabien Pinckaers <fp@odoo.com>