Remove BootstrapVue components from src/vendor directory
## Overview
All components importing vendored BootstrapVue files must be migrated. The following tracker provides an overview of the remaining components and directives that require migration:
[BootstrapVue Removal Tracker](https://bootstrap-vue-removal-tracker-e25ba4.gitlab.io/#/)
This Epic holds issues for each Bootstrap Vue (BSV) component. In https://gitlab.com/groups/gitlab-org/-/epics/16231+ we will remove the Bootstrap Vue components from Gl components. Once the BSV components are no longer used in Gl components we can remove them from the `vendor/bootstrap-vue` directory and close the corresponding issue in this Epic.
epic