Draw calls that batch in opaque pass do not batch in shadow pass when some of the draw calls come from SkinnedMeshRenderer and some come from MeshRenderer

Reproduction steps:
1. Open the user’s attached “1239248-SRP_Batching.zip“ project
2. Open the Frame Debugger window (Window > Analysis > Frame Debugger)
3. Click Enable
4. Compare the amount of calls in “MainLightShadow > Shadows.DrawSRPBatcher” and “DrawOpaqueObjects > RenderLoop.DrawSRPBatcher”

Expected result: Both have the same amount of calls
Actual result: “MainLightShadow > Shadows.DrawSRPBatcher“ has 2 calls, while “DrawOpaqueObjects > RenderLoop.DrawSRPBatcher” has only 1

Reproduced with: 10.9.0 (2020.3.35f1), 12.1.7 (2021.3.4f1), 13.1.8 (2022.1.4f1), 14.0.3 (2022.2.0a16)

Reproduced on: macOS Monterey 12.0.1 (Intel)