Shift job sidebar to fit "Always visible" scrollbars

What does this MR do and why?

Shift job sidebar to allow "Always visible" scrollbars to be seen correctly.

References

• https://gitlab.com/gitlab-org/gitlab/-/issues/567702#note_2800473647

Screenshots or screen recordings

Before	After

How to set up and validate locally

Run a pipeline with a job that 1) is long enough to require scrolling and, 2) has many "related jobs" with the parallel keyword so the sibebar can be scrolled as well.

This is one I am ussing:

stages: 
  - build

build-job: 
  stage: build
  parallel: 20
  script:
    - echo "Compiling the code..."
    - curl pkmn.li/25/
    - curl pkmn.li/26/
    - curl pkmn.li/27/
    - curl pkmn.li/28/
    - curl pkmn.li/29/
    - echo "Compile complete."

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