Remove use of deprecated "spaceless" filter in core templates

Problem/Motivation

%Since twig/twig 3.12: Twig Filter "spaceless" is deprecated%

Steps to reproduce

Proposed resolution

We can remove it without any problems and get better perfomance
https://github.com/twigphp/Twig/pull/4236
https://github.com/twigphp/Twig/pull/4308

Remaining tasks

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet