Revert "Add diagnostics to use module aliasing when duplicate targets found (#5606)" (#6961)

This reverts commit 33e05c7.

We should not make this suggestion without better contextual awareness because it can often be confusing, e.g. when someone is already using a module alias in a case where it isn't supposed to work (see #6841).

If we could find a way to confidently make the suggestion, we could bring it back, but currently it can be more confusing than not.

Author: neonichu

Sources/PackageLoading/PackageBuilder.swift

@@ -98,7 +98,7 @@ extension ModuleError: CustomStringConvertible {
         switch self {
         case .duplicateModule(let target, let packages):
             let packages = packages.map(\.description).sorted().joined(separator: "', '")
-            return "multiple targets named '\(target)' in: '\(packages)'; consider using the `moduleAliases` parameter in manifest to provide unique names"
+            return "multiple targets named '\(target)' in: '\(packages)'"
         case .moduleNotFound(let target, let type, let shouldSuggestRelaxedSourceDir):
             let folderName = (type == .test) ? "Tests" : (type == .plugin) ? "Plugins" : "Sources"
             var clauses = ["Source files for target \(target) should be located under '\(folderName)/\(target)'"]

Tests/PackageGraphTests/PackageGraphTests.swift

@@ -337,7 +337,7 @@ class PackageGraphTests: XCTestCase {
         )
 
         testDiagnostics(observability.diagnostics) { result in
-            result.check(diagnostic: "multiple targets named 'Bar' in: 'bar', 'foo'; consider using the `moduleAliases` parameter in manifest to provide unique names", severity: .error)
+            result.check(diagnostic: "multiple targets named 'Bar' in: 'bar', 'foo'", severity: .error)
         }
     }
 
@@ -396,7 +396,7 @@ class PackageGraphTests: XCTestCase {
         )
 
         testDiagnostics(observability.diagnostics) { result in
-            result.check(diagnostic: "multiple targets named 'First' in: 'first', 'fourth', 'second', 'third'; consider using the `moduleAliases` parameter in manifest to provide unique names", severity: .error)
+            result.check(diagnostic: "multiple targets named 'First' in: 'first', 'fourth', 'second', 'third'", severity: .error)
         }
     }
 
@@ -466,8 +466,8 @@ class PackageGraphTests: XCTestCase {
         )
 
         testDiagnostics(observability.diagnostics) { result in
-            result.checkUnordered(diagnostic: "multiple targets named 'Bar' in: 'fourth', 'third'; consider using the `moduleAliases` parameter in manifest to provide unique names", severity: .error)
-            result.checkUnordered(diagnostic: "multiple targets named 'Foo' in: 'first', 'second'; consider using the `moduleAliases` parameter in manifest to provide unique names", severity: .error)
+            result.checkUnordered(diagnostic: "multiple targets named 'Bar' in: 'fourth', 'third'", severity: .error)
+            result.checkUnordered(diagnostic: "multiple targets named 'Foo' in: 'first', 'second'", severity: .error)
         }
     }
 
@@ -535,7 +535,7 @@ class PackageGraphTests: XCTestCase {
         )
 
         testDiagnostics(observability.diagnostics) { result in
-            result.check(diagnostic: "multiple targets named 'First' in: 'first', 'fourth'; consider using the `moduleAliases` parameter in manifest to provide unique names", severity: .error)
+            result.check(diagnostic: "multiple targets named 'First' in: 'first', 'fourth'", severity: .error)
         }
     }
 
@@ -1255,7 +1255,7 @@ class PackageGraphTests: XCTestCase {
         )
 
         testDiagnostics(observability.diagnostics) { result in
-            result.check(diagnostic: "multiple targets named 'Foo' in: 'dep2', 'start'; consider using the `moduleAliases` parameter in manifest to provide unique names", severity: .error)
+            result.check(diagnostic: "multiple targets named 'Foo' in: 'dep2', 'start'", severity: .error)
         }
     }