(#22414) Rename for consistency `$custom-checkbox-border-radius`, `$custom-checkbox-icon-checked`, `$custom-checkbox-indeterminate-bg`, `$custom-checkbox-icon-indeterminate`, `$custom-checkbox-indeterminate-box-shadow`, `$custom-radio-border-radius`, `$custom-radio-icon-checked` to `$custom-checkbox-indicator-border-radius`, `$custom-checkbox-indicator-icon-checked`, `$custom-checkbox-indicator-indeterminate-bg`, `$custom-checkbox-indicator-icon-indeterminate`, `$custom-checkbox-indicator-indeterminate-box-shadow`, `$custom-radio-indicator-border-radius`, `$custom-radio-indicator-icon-checked`, respectively