Remove BFormCheckbox from GlFormCheckbox

BootstrapVue props we should support

• aria-label
• aria-labelledby
• checked
• disabled
• id
• indeterminate
• name
• required
• state
• unchecked-value
• value

BootstrapVue props we should consider not supporting

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.

• autofocus
• button
• button-variant
• form
• switch
• inline
• plain
• size

BootstrapVue slots we should support

• default

BootstrapVue events we should support

• change
• input