Add support for more scalability modes (1.5:1 resolution ratio).

Added modes:
- S2T1h
- S2T2h
- S2T3h
- S3T1h
- S3T2h
- S3T3h

Bug: webrtc:13960
Change-Id: I618a30c68b0ce1609847ee33a2298fe8fa0720c9
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/273664
Reviewed-by: Florent Castelli <orphis@webrtc.org>
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Commit-Queue: Åsa Persson <asapersson@webrtc.org>
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#37968}

pc/peer_connection_factory_unittest.cc

@@ -222,11 +222,17 @@ class PeerConnectionFactoryTest : public ::testing::Test {
                 webrtc::ScalabilityMode::kL3T3h,
                 webrtc::ScalabilityMode::kL3T3_KEY,
                 webrtc::ScalabilityMode::kS2T1,
+                webrtc::ScalabilityMode::kS2T1h,
                 webrtc::ScalabilityMode::kS2T2,
+                webrtc::ScalabilityMode::kS2T2h,
                 webrtc::ScalabilityMode::kS2T3,
+                webrtc::ScalabilityMode::kS2T3h,
                 webrtc::ScalabilityMode::kS3T1,
+                webrtc::ScalabilityMode::kS3T1h,
                 webrtc::ScalabilityMode::kS3T2,
-                webrtc::ScalabilityMode::kS3T3)
+                webrtc::ScalabilityMode::kS3T2h,
+                webrtc::ScalabilityMode::kS3T3,
+                webrtc::ScalabilityMode::kS3T3h)
             // clang-format on
             )
             << "Codec: " << codec.name;