Bulk sidebar: Fix border bleeding into layout when collapsed

What does this MR do and why?

Bulk sidebar: Fix border bleeding into layout when collapsed

Screenshots or screen recordings

Before After
before after_colapsed
before_hotpink
before_expanded after_open

How to set up and validate locally

  1. Go to https://gdk.test:3000/flightjs/Flight/-/issues, select on Bulk edit
  2. Go to https://gdk.test:3000/flightjs/Flight/-/merge_requests, select on Bulk edit

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #548836 (closed)

Merge request reports

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