fix: separate golang license caches from mod dir (#2852)

Signed-off-by: Keith Zantow <kzantow@gmail.com>

internal/cache/bypass_test.go

@@ -0,0 +1,18 @@
+package cache
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func Test_bypassedCache(t *testing.T) {
+	m := bypassedCache{}
+	cache := m.GetCache("name", "version")
+	err := cache.Write("test", strings.NewReader("value"))
+	require.NoError(t, err)
+	rdr, err := cache.Read("test")
+	require.Nil(t, rdr)
+	require.ErrorIs(t, err, errNotFound)
+}