Simplify typealias translator (#2126)

Motivation:

The typealias used to generte an enum per package name and nested enums
for each service within that namespace. In order for that to work, the
services had to be grouped by namespace. This is no longer the case,
each service is generated within a combined package-service enum.

It's simpler to just generate the services in the order they are
created.

Modifications:

- Remove the sorting
- Remove tests which test the unwanted behaviour

Result:

Less code

Sources/GRPCCodeGen/Internal/Translator/TypealiasTranslator.swift

@@ -81,25 +81,22 @@ struct TypealiasTranslator: SpecializedTranslator {
 
   func translate(from codeGenerationRequest: CodeGenerationRequest) throws -> [CodeBlock] {
     var codeBlocks = [CodeBlock]()
-    let services = codeGenerationRequest.services
-    let servicesByEnumName = Dictionary(
-      grouping: services,
-      by: { $0.namespacedGeneratedName }
-    )
 
-    // Sorting the keys of the dictionary is necessary so that the generated enums are deterministically ordered.
-    for (generatedEnumName, services) in servicesByEnumName.sorted(by: { $0.key < $1.key }) {
-      for service in services {
-        codeBlocks.append(
-          CodeBlock(
-            item: .declaration(try self.makeServiceEnum(from: service, named: generatedEnumName))
+    for service in codeGenerationRequest.services {
+      codeBlocks.append(
+        CodeBlock(
+          item: .declaration(
+            try self.makeServiceEnum(
+              from: service,
+              named: service.namespacedGeneratedName
+            )
           )
         )
+      )
 
-        codeBlocks.append(
-          CodeBlock(item: .declaration(self.makeServiceDescriptorExtension(for: service)))
-        )
-      }
+      codeBlocks.append(
+        CodeBlock(item: .declaration(self.makeServiceDescriptorExtension(for: service)))
+      )
     }
 
     return codeBlocks