Werk #12831: Improve page breaks when rendering graph columns over multiple pages

This change fixes a layout problem of reports or PDF exports of views containing graph columns which fill multiple pages. Previous Checkmk versions were displaying one or multiple empty pages in such a situation or pages which are not fully populated by graphs.

The layout of graphs columns has now been improved to work better in common situation. Even though the new layout algorithm is better than the previous one in specific situations, there are still several cases that are not handled ideally. To improve this further would require major rebuilding work that cannot be done as part of a bug fix of the stable version.

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