internal/osv,static/frontend/vuln: add a chip for standard library vulns

Change-Id: I0cb26136ddd58afbb53312dbd93f3ca1a5b8388f
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/581176
Run-TryBot: Tatiana Bradley <tatianabradley@google.com>
kokoro-CI: kokoro <noreply+kokoro@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Damien Neil <dneil@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

internal/osv/affected.go

@@ -23,3 +23,13 @@ func (e Entry) AffectedModulesAndPackages() []string {
 	}
 	return affected
 }
+
+func (e *Entry) AffectsStandardLibrary() bool {
+	for _, a := range e.Affected {
+		m := a.Module.Path
+		if m == GoStdModulePath || m == GoCmdModulePath {
+			return true
+		}
+	}
+	return false
+}

static/frontend/vuln/vuln.tmpl

@@ -79,4 +79,7 @@
   {{if .Withdrawn}}
     <span class="go-Chip go-Chip--subtle">withdrawn</span>
   {{end}}
+  {{if .AffectsStandardLibrary}}
+    <span class="go-Chip go-Chip-inverted">standard library</span>
+  {{end}}
 {{end}}