Remove `BModal` from `GlModal`
## [BootstrapVue props we should support](https://bootstrap-vue.org/docs/components/modal#comp-ref-b-modal-props)
- `aria-label`
- `auto-focus-button`
- `body-bg-variant`
- `body-class`
- `body-text-variant`
- `busy`
- `button-size`
- `cancel-disabled`
- `cancel-title`
- `cancel-title-html`
- `Use with caution"`
- `cancel-variant`
- `centered`
- `content-class`
- `dialog-class`
- `footer-bg-variant`
- `footer-border-variant`
- `footer-class`
- `footer-tag`
- `footer-text-variant`
- `header-bg-variant`
- `header-border-variant`
- `header-class`
- `header-close-content`
- `header-close-label`
- `header-close-variant`
- `header-tag`
- `header-text-variant`
- `hide-backdrop`
- `hide-footer`
- `hide-header`
- `hide-header-close`
- `id`
- `ignore-enforce-focus-selector`
- `lazy`
- `modal-class`
- `no-close-on-backdrop`
- `no-close-on-esc`
- `no-enforce-focus`
- `no-fade`
- `no-stacking`
- `ok-disabled`
- `ok-only`
- `ok-title`
- `ok-title-html`
- `ok-variant`
- `return-focus`
- `scrollable`
- `size`
- `static`
- `title`
- `title-class`
- `title-html`
- `title-sr-only`
- `title-tag`
- `visible`
## [BootstrapVue props we should consider _not_ supporting](https://bootstrap-vue.org/docs/components/modal#comp-ref-b-modal-props)
https://gitlab-org.gitlab.io/frontend/bootstrapvue-component-usage-breakdown/components.json can be used as a starting point to see if the prop is used, but should not be considered an exhaustive list (it does not check https://gitlab.com/gitlab-org/customers-gitlab-com/ or Switchboard, please do this manually). We should weigh the pros and cons of supporting each prop individually.
Needs more investigation, this will be a complicated migration
## [BootstrapVue slots we should support](https://bootstrap-vue.org/docs/components/modal#comp-ref-b-modal-slots)
Needs more investigation, this will be a complicated migration
## [BootstrapVue events we should support](https://bootstrap-vue.org/docs/components/modal#comp-ref-b-modal-events)
Needs more investigation, this will be a complicated migration
issue