internal/chartconfig: update config to add VulncheckMode options counter

Fixes golang/go#75657

Change-Id: I326120c2cac622a149d7ba8d846f440859d1f816
Reviewed-on: https://go-review.googlesource.com/c/telemetry/+/707895
Auto-Submit: Ethan Lee <ethanalee@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

internal/chartconfig/config.txt

diff --git a/internal/chartconfig/config.txt b/internal/chartconfig/config.txt
index 86d838d..0279224 100644
--- a/internal/chartconfig/config.txt
+++ b/internal/chartconfig/config.txt
@@ -315,3 +315,12 @@
 program: golang.org/x/tools/gopls
 module: golang.org/x/tools/gopls
 version: v0.21.0
+---
+counter: gopls/setting/vulncheck:{Off,Imports}
+title: VulncheckMode Option Usage
+description: counts VulncheckMode option settings
+type: partition
+issue: https://github.com/golang/go/issues/75657
+program: golang.org/x/tools/gopls
+module: golang.org/x/tools/gopls
+version: v0.21.0