Fix bug detecting if go.mod files are nested

Author: owen-mc

go/extractor/cli/go-autobuilder/go-autobuilder.go

@@ -249,8 +249,16 @@ func getDirs(paths []string) []string {
 	return dirs
 }
 
-// Note this has the side effect of sorting `dirs`
-func checkDirsNested(dirs []string) bool {
+func checkDirsNested(inputDirs []string) bool {
+	// replace "." with "" so that we can check if all the paths are nested
+	dirs := make([]string, len(inputDirs))
+	for i, inputDir := range inputDirs {
+		if inputDir == "." {
+			dirs[i] = ""
+		} else {
+			dirs[i] = inputDir
+		}
+	}
 	// the paths were generated by a depth-first search so I think they might
 	// be sorted, but we sort them just in case
 	sort.Strings(dirs)

go/ql/integration-tests/all-platforms/go/two-go-mods-one-in-root/diagnostics.expected

@@ -3,8 +3,8 @@
   "severity": "note",
   "source": {
     "extractorName": "go",
-    "id": "go/autobuilder/multiple-go-mod-found-not-nested",
-    "name": "Multiple `go.mod` files found, not all nested under one root `go.mod` file"
+    "id": "go/autobuilder/multiple-go-mod-found-nested",
+    "name": "Multiple `go.mod` files were found, all nested under one root `go.mod` file"
   },
   "visibility": {
     "cliSummaryTable": false,