Update getContentWrapperHeight usage in drawers
What does this MR do and why?
!121966 (merged) adds .content-wrapper as default argument in getContentWrapperHeight so that implementations of GlDrawer with :header-height no longer need to add an argument.
Screenshots or screen recordings
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How to set up and validate locally
- Enable system header in admin settings
- Toggle the performance bar with p + b
- View drawers
- Confirm top position is correct
Note: how to set up and validate drawers behind feature flags locally
- Admin runners !112561 (merged)
- Job assistant !111122 (merged)
- Generate test file !118365 (merged)
- Explain this vulnerability !117667 (merged)
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR. 
Related to #412976 (closed)
Edited  by Scott de Jonge