don't add paths multiple times in PathsWithMark

PathsWithMark was adding the same path multiple times if it had multiple
extra marks.

internal/lang/marks/paths.go

@@ -31,9 +31,12 @@ func PathsWithMark(pvms []cty.PathValueMarks, wantMark any) (withWanted []cty.Pa
 		if _, ok := pvm.Marks[wantMark]; ok {
 			withWanted = append(withWanted, pvm.Path)
 		}
+
 		for mark := range pvm.Marks {
 			if mark != wantMark {
 				withOthers = append(withOthers, pvm)
+				// only add a path with unwanted marks a single time
+				break
 			}
 		}
 	}

internal/lang/marks/paths_test.go

@@ -16,7 +16,7 @@ func TestPathsWithMark(t *testing.T) {
 	input := []cty.PathValueMarks{
 		{
 			Path:  cty.GetAttrPath("sensitive"),
-			Marks: cty.NewValueMarks(Sensitive),
+			Marks: cty.NewValueMarks("sensitive"),
 		},
 		{
 			Path:  cty.GetAttrPath("other"),
@@ -24,11 +24,15 @@ func TestPathsWithMark(t *testing.T) {
 		},
 		{
 			Path:  cty.GetAttrPath("both"),
-			Marks: cty.NewValueMarks(Sensitive, "other"),
+			Marks: cty.NewValueMarks("sensitive", "other"),
+		},
+		{
+			Path:  cty.GetAttrPath("neither"),
+			Marks: cty.NewValueMarks("x", "y"),
 		},
 	}
 
-	gotPaths, gotOthers := PathsWithMark(input, Sensitive)
+	gotPaths, gotOthers := PathsWithMark(input, "sensitive")
 	wantPaths := []cty.Path{
 		cty.GetAttrPath("sensitive"),
 		cty.GetAttrPath("both"),
@@ -40,7 +44,7 @@ func TestPathsWithMark(t *testing.T) {
 		},
 		{
 			Path:  cty.GetAttrPath("both"),
-			Marks: cty.NewValueMarks(Sensitive, "other"),
+			Marks: cty.NewValueMarks("sensitive", "other"),
 			// Note that this intentionally preserves the fact that the
 			// attribute was both sensitive _and_ had another mark, since
 			// that gives the caller the most possible information to
@@ -48,6 +52,10 @@ func TestPathsWithMark(t *testing.T) {
 			// an error message, or whatever. It also conveniently avoids
 			// allocating a new mark set, which is nice.
 		},
+		{
+			Path:  cty.GetAttrPath("neither"),
+			Marks: cty.NewValueMarks("x", "y"),
+		},
 	}
 
 	if diff := cmp.Diff(wantPaths, gotPaths, ctydebug.CmpOptions); diff != "" {