EZP-30906: Removed deprecated templating component integration

[ViniTou]

Question	Answer
JIRA issue	EZP-30906
Bug/Improvement	yes
New feature	no
Target version	master
BC breaks	no
Tests pass	yes
Doc needed	no

main PR:
ezsystems/ezplatform#453

TODO:

• Implement feature / fix a bug.
• Implement tests.
• Fix new code according to Coding Standards ($ composer fix-cs).
• Ask for Code Review.

[mikadamczyk]

I know that this could be a little out of the scope but could we extract

        $this->loaderMock
            ->method('exists')
            ->with($templateName)
            ->willReturn(false);
        $this->templateEngineMock
            ->expects($this->once())
            ->method('getLoader')
            ->willReturn($this->loaderMock);

to private method to simplify and reduce number of lines?