Change CI lint primary button style

Changelog: changed
MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/81611

app/assets/javascripts/ci_lint/components/ci_lint.vue

@@ -103,7 +103,7 @@ export default {
           class="gl-mr-4"
           :loading="loading"
           category="primary"
-          variant="success"
+          variant="confirm"
           data-testid="ci-lint-validate"
           @click="lint"
           >{{ __('Validate') }}</gl-button