Make is:tentative match tentative directories

Per https://web-platform-tests.org/writing-tests/file-names.html,
tentative can be set at a directory level via the directory being
called "tentative".

api/query/cache/index/filter.go

@@ -385,7 +385,7 @@ func (q MetadataQuality) Filter(t TestID) bool {
 			return false
 		}
 
-		return strings.Contains(name, ".tentative.")
+		return strings.Contains(name, ".tentative.") || strings.Contains(name, "/tentative/")
 	case query.MetadataQualityOptional:
 		// is:optional only returns rows from tests with .optional.
 		// in their name. See

api/query/cache/index/index_filter_test.go

@@ -1037,6 +1037,14 @@ func TestBindExecute_IsTentative(t *testing.T) {
 						Test:   "/a/b/c.tentative.html",
 						Status: "PASS",
 					},
+					{
+						Test:   "/a/b/tentative/c",
+						Status: "PASS",
+					},
+					{
+						Test:   "/a/b/tentative/c.tentative.html",
+						Status: "PASS",
+					},
 				},
 			},
 		},
@@ -1050,20 +1058,38 @@ func TestBindExecute_IsTentative(t *testing.T) {
 	srs, ok := res.([]shared.SearchResult)
 	assert.True(t, ok)
 
-	assert.Equal(t, 1, len(srs))
-	expectedResult := shared.SearchResult{
-		Test: "/a/b/c.tentative.html",
-		LegacyStatus: []shared.LegacySearchRunResult{
-			{
-				Passes:        1,
-				Total:         1,
-				Status:        "",
-				NewAggProcess: true,
+	assert.Equal(t, 3, len(srs))
+	assert.Equal(t, resultSet(t, []shared.SearchResult{
+		{
+			Test: "/a/b/c.tentative.html",
+			LegacyStatus: []shared.LegacySearchRunResult{
+				{
+					Passes:        1,
+					Total:         1,
+					Status:        "",
+					NewAggProcess: true,
+				},
+			},
+			Test: "/a/b/tentative/c.html",
+			LegacyStatus: []shared.LegacySearchRunResult{
+				{
+					Passes:        1,
+					Total:         1,
+					Status:        "",
+					NewAggProcess: true,
+				},
+			},
+			Test: "/a/b/tentative/c.tentative.html",
+			LegacyStatus: []shared.LegacySearchRunResult{
+				{
+					Passes:        1,
+					Total:         1,
+					Status:        "",
+					NewAggProcess: true,
+				},
 			},
 		},
-	}
-
-	assert.Equal(t, expectedResult, srs[0])
+	}), resultSet(t, srs))
 }
 
 func TestBindExecute_IsOptional(t *testing.T) {