All other charts expose charts options via an `option` property,
the heatmap chart should follow the same pattern

fix(Heatmap): rename `options` prop to `option` to be consistent

See merge request gitlab-org/gitlab-ui!4400



Merged-by: Scott de Jonge <sdejonge@gitlab.com>
Approved-by: Scott de Jonge <sdejonge@gitlab.com>
Reviewed-by: Ezekiel Kigbo <3397881-ekigbo@users.noreply.gitlab.com>
Co-authored-by: Ezekiel Kigbo <ekigbo@gitlab.com>

## [86.14.1](gitlab-org/gitlab-ui@v86.14.0...v86.14.1) (2024-07-19)

### Bug Fixes

* **Heatmap:** rename `options` prop to `option` to be consistent ([8fcf7f66](gitlab-org/gitlab-ui@8fcf7f66))