Handle dismiss finding logic

What does this MR do and why?

Handles logic for dismissing a vulnerability.

Screenshots or screen recordings

How to set up and validate locally

Requirements:

1. You'll need an EE License
2. You'll need to have runners enabled (See $2408961 for setting up a runner)
3. Enable :refactor_security_extension to turn this feature on.

echo "Feature.enable(:refactor_security_extension)" | rails c

Steps:

1. Import https://gitlab.com/gitlab-examples/security/security-reports
2. Create a new MR by modifying a file
3. Toggle security reports
4. Click on a finding name
5. Dismiss the vulnerability from the modal

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #386012 (closed)

ee/app/assets/javascripts/vue_merge_request_widget/extensions/security_reports/mr_widget_security_reports.vue

@@ -3,10 +3,12 @@ import { GlBadge, GlButton } from '@gitlab/ui';
 import { SEVERITY_LEVELS } from 'ee/security_dashboard/store/constants';
 import MrWidget from '~/vue_merge_request_widget/components/widget/widget.vue';
 import MrWidgetRow from '~/vue_merge_request_widget/components/widget/widget_content_row.vue';
-import { BV_SHOW_MODAL } from '~/lib/utils/constants';
+import toast from '~/vue_shared/plugins/global_toast';
+import { BV_SHOW_MODAL, BV_HIDE_MODAL } from '~/lib/utils/constants';
 import axios from '~/lib/utils/axios_utils';
+import { HTTP_STATUS_UNPROCESSABLE_ENTITY } from '~/lib/utils/http_status';
 import { visitUrl } from '~/lib/utils/url_utility';
-import { s__ } from '~/locale';
+import { s__, sprintf } from '~/locale';
 import FindingModal from 'ee/vue_shared/security_reports/components/modal.vue';
 import { VULNERABILITY_MODAL_ID } from 'ee/vue_shared/security_reports/components/constants';
 import { EXTENSION_ICONS } from '~/vue_merge_request_widget/constants';
@@ -160,6 +162,10 @@ export default {
           this.modalData?.vulnerability?.create_jira_issue_url,
       );
     },
+
+    canDismissFinding() {
+      return Boolean(this.mr.createVulnerabilityFeedbackDismissalPath);
+    },
   },
   methods: {
     handleIsLoading(value) {
@@ -273,6 +279,46 @@ export default {
           this.isCreatingIssue = false;
         });
     },
+
+    dismissFinding(comment) {
+      const finding = this.modalData?.vulnerability;
+      const toastMsg = sprintf(s__("SecurityReports|Dismissed '%{vulnerabilityName}'"), {
+        vulnerabilityName: finding.name,
+      });
+
+      return axios
+        .post(this.mr.createVulnerabilityFeedbackDismissalPath, {
+          vulnerability_feedback: {
+            category: finding.report_type,
+            comment,
+            feedback_type: 'dismissal',
+            pipeline_id: this.mr.pipelineId,
+            project_fingerprint: finding.project_fingerprint,
+            finding_uuid: finding.uuid,
+            vulnerability_data: finding,
+          },
+        })
+        .then(() => {
+          this.modalData.vulnerability.state = 'dismissed';
+          this.$root.$emit(BV_HIDE_MODAL, VULNERABILITY_MODAL_ID);
+          toast(toastMsg);
+        })
+        .catch((error) => {
+          const pipelineNoLongerExists =
+            error.response?.status === HTTP_STATUS_UNPROCESSABLE_ENTITY;
+
+          const errorMessage = pipelineNoLongerExists
+            ? s__(
+                'ciReport|Could not dismiss vulnerability because the associated pipeline no longer exists. Refresh the page and try again.',
+              )
+            : s__('ciReport|There was an error dismissing the vulnerability. Please try again.');
+
+          this.modalData = {
+            ...this.modalData,
+            error: errorMessage,
+          };
+        });
+    },
   },
   SEVERITY_LEVELS,
   widgetHelpPopover: {
@@ -315,7 +361,9 @@ export default {
         :is-creating-merge-request="false"
         :is-creating-issue="isCreatingIssue"
         :can-create-issue="canCreateIssue"
+        :can-dismiss-vulnerability="canDismissFinding"
         @createNewIssue="createNewIssue"
+        @dismissVulnerability="dismissFinding"
       />
       <security-training-promo-widget
         :security-configuration-path="mr.securityConfigurationPath"