Load graph to correct size in query plan view

[laurennat]

          Another issue to look at is the sizing of the plan control when the sqlplan file contains multiple queries.  The document should look similar to in ADS (shown below) where the graphs take a proportional amount of space based on the size of the plan tree.  In VS Code the first graph consumes the whole document space regardless of plan contents, and second plan is below but not initially visible without scrolling.

ADS

VS Code

Originally posted by @kburtram in #17983 (comment)