Adding System.Text.Encodings.Web to unification rules

Author: fabiocav

src/WebJobs.Script/runtimeassemblies.json

@@ -1302,6 +1302,10 @@
       "name": "System.Text.Encoding",
       "resolutionPolicy": "minorMatchOrLower"
     },
+    {
+      "name": "System.Text.Encodings.Web",
+      "resolutionPolicy": "minorMatchOrLower"
+    },
     {
       "name": "System.Text.Encoding.CodePages",
       "resolutionPolicy": "minorMatchOrLower"

tools/ExtensionsMetadataGenerator/test/ExtensionsMetadataGeneratorTests/ExistingRuntimeAssemblies.txt

@@ -304,6 +304,7 @@ System.ServiceProcess.dll
 System.Text.Encoding.dll
 System.Text.Encoding.CodePages.dll
 System.Text.Encoding.Extensions.dll
+System.Text.Encodings.Web.dll
 System.Text.RegularExpressions.dll
 System.Threading.dll
 System.Threading.Channels.dll