Backport UUM-29958 Wrong Blit Texture Source when using SetGlobalKeyword

JIRA: [UUM-29958](https://jira.unity3d.com/browse/UUM-29958)

Blit uses wrong texture source when using blit that sets texture using SetGlobalTexture right after a blit that sets texture using property block.
Based on the comments on the task, it looks like the expected behavior was that property blocks are cleared after each blit, but that wasn't happening. I added a clear after each blit that uses property block, so now they are indeed cleared after each blit and don't interfere with blits that use SetGlobalTexture

Packages/com.unity.render-pipelines.core/Runtime/Utilities/Blitter.cs

@@ -190,6 +190,7 @@ static private void DrawTriangle(CommandBuffer cmd, Material material, int shade
                 cmd.DrawMesh(s_TriangleMesh, Matrix4x4.identity, material, 0, shaderPass, s_PropertyBlock);
             else
                 cmd.DrawProcedural(Matrix4x4.identity, material, shaderPass, MeshTopology.Triangles, 3, 1, s_PropertyBlock);
+            s_PropertyBlock.Clear();
         }
 
         static internal void DrawQuad(CommandBuffer cmd, Material material, int shaderPass)
@@ -198,6 +199,7 @@ static internal void DrawQuad(CommandBuffer cmd, Material material, int shaderPa
                 cmd.DrawMesh(s_QuadMesh, Matrix4x4.identity, material, 0, shaderPass, s_PropertyBlock);
             else
                 cmd.DrawProcedural(Matrix4x4.identity, material, shaderPass, MeshTopology.Quads, 4, 1, s_PropertyBlock);
+            s_PropertyBlock.Clear();
         }
 
         /// <summary>
@@ -261,7 +263,7 @@ public static void BlitTexture(CommandBuffer cmd, RTHandle source, Vector4 scale
             s_PropertyBlock.SetTexture(BlitShaderIDs._BlitTexture, source);
             DrawTriangle(cmd, material, pass);
         }
-        
+
         /// <summary>
         /// Blit a RTHandle texture
         /// </summary>
@@ -311,7 +313,7 @@ public static void BlitTexture(CommandBuffer cmd, RenderTargetIdentifier source,
             cmd.SetRenderTarget(destination, loadAction, storeAction);
             DrawTriangle(cmd, material, pass);
         }
-        
+
         /// <summary>
         /// Blit a Texture with a given Material. Unity uses the reference name `_BlitTexture` to bind the input texture. Set the destination parameter before using this method.
         /// </summary>