When rendering a view with annotate_rendered_view_with_filenames
enabled, we were inserting newlines after the BEGIN and END
comments. These newlines are not ideal in some use cases, such
as rendering templates to strings that are then passed around
our application.

As the newlines were added for aesthetic purposes, we think it
makes sense to remove them so that rendered template strings do
not contain extraneous newlines.

As a result of removing these newlines, the annotations
no longer affect the reporting of template error on the correct
line, as addressed in #38950. As such, we've reverted those
changes as well.

Co-authored-by: Chris Gavin <chrisgavin@github.com>