Revert multi-client broadcast test skips for CLI 1.0.7

Remove the t.Skip/pytest.skip/Fact(Skip=...) additions that were
disabling the multi-client broadcast tests across Go, Python, and C#.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: 2 people

dotnet/test/MultiClientTests.cs

@@ -92,7 +92,7 @@ public async Task DisposeAsync()
 
     private CopilotClient Client2 => _client2 ?? throw new InvalidOperationException("Client2 not initialized");
 
-    [Fact(Skip = "CLI 1.0.7 no longer broadcasts external_tool events to secondary clients")]
+    [Fact]
     public async Task Both_Clients_See_Tool_Request_And_Completion_Events()
     {
         var tool = AIFunctionFactory.Create(MagicNumber, "magic_number");

go/internal/e2e/multi_client_test.go

@@ -44,7 +44,6 @@ func TestMultiClient(t *testing.T) {
 	t.Cleanup(func() { client2.ForceStop() })
 
 	t.Run("both clients see tool request and completion events", func(t *testing.T) {
-		t.Skip("Skipped: CLI 1.0.7 no longer broadcasts external_tool events to secondary clients")
 		ctx.ConfigureForTest(t)
 
 		type SeedParams struct {

python/e2e/test_multi_client.py

@@ -189,7 +189,7 @@ async def test_both_clients_see_tool_request_and_completion_events(
         self, mctx: MultiClientContext
     ):
         """Both clients see tool request and completion events."""
-        pytest.skip("CLI 1.0.7 no longer broadcasts external_tool events to secondary clients")
+
 
         class SeedParams(BaseModel):
             seed: str = Field(description="A seed value")