This MR updates the charts component to use the `toolbox.show`
property from options to render the chart toolbox.

Previously the show (boolean) attribute was not being used,
instead a toolbox would be rendered if an object was passed
in specifying the SVG icons to be used for the toolbox.

feat(Charts): use `options.toolbox.show` to show/hide toolbox

See merge request gitlab-org/gitlab-ui!4352



Merged-by: Peter Hegman <phegman@gitlab.com>
Approved-by: Scott Hampton <shampton@gitlab.com>
Approved-by: Peter Hegman <phegman@gitlab.com>
Co-authored-by: Ezekiel Kigbo <ekigbo@gitlab.com>

# [86.12.0](gitlab-org/gitlab-ui@v86.11.1...v86.12.0) (2024-07-16)

### Features

* **Charts:** use options.toolbox.show to show/hide toolbox ([5e8c4624](gitlab-org/gitlab-ui@5e8c4624))