Add missing Snyk / SCA / SAST scans to CI

To resolve https://gds.slack.com/archives/C02L13S214K/p1714381348726429

.github/workflows/ci.yml

@@ -7,6 +7,25 @@ on:
   pull_request:
 
 jobs:
+  snyk-security:
+    name: SNYK security analysis
+    uses: alphagov/govuk-infrastructure/.github/workflows/snyk-security.yml@main
+    secrets: inherit
+    permissions:
+      contents: read
+      security-events: write
+      actions: read
+
+  codeql-sast:
+    name: CodeQL SAST scan
+    uses: alphagov/govuk-infrastructure/.github/workflows/codeql-analysis.yml@main
+    permissions:
+      security-events: write
+
+  dependency-review:
+    name: Dependency Review scan
+    uses: alphagov/govuk-infrastructure/.github/workflows/dependency-review.yml@main
+
   test:
     name: Test Extension JS
     runs-on: ubuntu-latest