internal/scan: add format and scan level telemetry

Change-Id: I9564ea12001d0ae4c173e051394dee3c12f459f1
Reviewed-on: https://go-review.googlesource.com/c/vuln/+/589395
TryBot-Result: Gopher Robot <gobot@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Maceo Thompson <maceothompson@google.com>
Run-TryBot: Zvonimir Pavlinovic <zpavlinovic@google.com>

internal/scan/run.go

@@ -56,6 +56,8 @@ func RunGovulncheck(ctx context.Context, env []string, r io.Reader, stdout io.Wr
 	}
 
 	counter.Inc(fmt.Sprintf("govulncheck/mode:%s", cfg.ScanMode))
+	counter.Inc(fmt.Sprintf("govulncheck/scan:%s", cfg.ScanLevel))
+	counter.Inc(fmt.Sprintf("govulncheck/format:%s", cfg.format))
 
 	switch cfg.ScanMode {
 	case govulncheck.ScanModeSource: