Apply new header-height logic to board-setting-sidebar

As per the conversation found !38527 (comment 397317373). We need to adjust the approach for calculating height for the board sidebar.

added devopsplan featureaddition frontend groupproject management labels

added typefeature label

mentioned in merge request !38527 (merged)

added to epic &3352 (closed)

added sectiondev label

mentioned in issue #240839 (closed)

mentioned in issue #243452 (closed)

mentioned in issue #246443 (closed)

mentioned in issue #249045 (closed)

mentioned in issue #254146 (closed)

mentioned in issue #257772 (closed)

mentioned in issue #261979 (closed)

closed