Remove `BFormTextarea` from `GlFormTextarea`
## [BootstrapVue props we should support](https://bootstrap-vue.org/docs/components/form-textarea#component-reference) - `aria-invalid` - `autocomplete` - `autofocus` - `debounce` - `disabled` - `id` - `max-rows` - `name` - `no-resize` - `placeholder` - `readonly` - `required` - `rows` - `size` - `state` - `trim` - `value` ## [BootstrapVue props we should consider _not_ supporting](https://bootstrap-vue.org/docs/components/form-textarea#component-reference) 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. - `form` - `formatter` - `lazy` - `lazy-formatter` - `no-auto-shrink` - `number` - `plaintext` - `wrap` ## [BootstrapVue events we should support](https://bootstrap-vue.org/docs/components/form-textarea#comp-ref-b-form-textarea-events) - `blur` - `change` - `input` - `update`
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