Fix flaky test (dotnet#13328)

- The tests were using WaitForTextAsync("Application started.") without specifying a resource name. When myworker1 (the worker process)
  started faster than mywebapp1 (the web app) and logged "Application started." first, the wait completed even though mywebapp1 wasn't ready yet. The
  subsequent HTTP request to mywebapp1 resulted in a 400 Bad Request because the app wasn't listening.

Author: davidfowl

tests/Aspire.Hosting.Testing.Tests/TestingBuilderTests.cs

@@ -181,8 +181,9 @@ public async Task HttpClientGetTest(bool genericEntryPoint)
         await using var app = await builder.BuildAsync();
         await app.StartAsync();
 
-        // Wait for the application to be ready
-        await app.WaitForTextAsync("Application started.").WaitAsync(TimeSpan.FromMinutes(1));
+        // Wait for the application to be ready - must specify "mywebapp1" to avoid race condition
+        // where myworker1 logs "Application started." first
+        await app.WaitForTextAsync("Application started.", "mywebapp1").WaitAsync(TimeSpan.FromMinutes(1));
 
         var httpClient = app.CreateHttpClientWithResilience("mywebapp1", null, opts =>
         {
@@ -240,8 +241,9 @@ public async Task ArgsPropagateToAppHostConfiguration(bool genericEntryPoint, bo
         await using var app = await builder.BuildAsync();
         await app.StartAsync();
 
-        // Wait for the application to be ready
-        await app.WaitForTextAsync("Application started.").WaitAsync(TimeSpan.FromMinutes(1));
+        // Wait for the application to be ready - must specify "mywebapp1" to avoid race condition
+        // where myworker1 logs "Application started." first
+        await app.WaitForTextAsync("Application started.", "mywebapp1").WaitAsync(TimeSpan.FromMinutes(1));
 
         var httpClient = app.CreateHttpClientWithResilience("mywebapp1", null, opts =>
         {
@@ -278,8 +280,9 @@ public async Task ArgsPropagateToAppHostConfigurationAdHocBuilder(bool directArg
         await using var app = await builder.BuildAsync();
         await app.StartAsync();
 
-        // Wait for the application to be ready
-        await app.WaitForTextAsync("Application started.").WaitAsync(TimeSpan.FromMinutes(1));
+        // Wait for the application to be ready - must specify "mywebapp1" to avoid race condition
+        // where myworker1 logs "Application started." first
+        await app.WaitForTextAsync("Application started.", "mywebapp1").WaitAsync(TimeSpan.FromMinutes(1));
 
         var httpClient = app.CreateHttpClientWithResilience("mywebapp1", null, opts =>
         {
@@ -321,8 +324,9 @@ public async Task CanOverrideLaunchProfileViaArgs(string launchProfileName, bool
         await using var app = await builder.BuildAsync();
         await app.StartAsync();
 
-        // Wait for the application to be ready
-        await app.WaitForTextAsync("Application started.").WaitAsync(TimeSpan.FromMinutes(1));
+        // Wait for the application to be ready - must specify "mywebapp1" to avoid race condition
+        // where myworker1 logs "Application started." first
+        await app.WaitForTextAsync("Application started.", "mywebapp1").WaitAsync(TimeSpan.FromMinutes(1));
 
         var httpClient = app.CreateHttpClientWithResilience("mywebapp1", null, opts =>
         {
@@ -372,8 +376,9 @@ public async Task CanOverrideLaunchProfileViaArgsAdHocBuilder(string launchProfi
         await using var app = await builder.BuildAsync();
         await app.StartAsync();
 
-        // Wait for the application to be ready
-        await app.WaitForTextAsync("Application started.").WaitAsync(TimeSpan.FromMinutes(1));
+        // Wait for the application to be ready - must specify "mywebapp1" to avoid race condition
+        // where myworker1 logs "Application started." first
+        await app.WaitForTextAsync("Application started.", "mywebapp1").WaitAsync(TimeSpan.FromMinutes(1));
 
         var httpClient = app.CreateHttpClientWithResilience("mywebapp1", null, opts =>
         {
@@ -421,8 +426,9 @@ public async Task SelectsFirstLaunchProfile(bool genericEntryPoint)
         var profileName = config["DOTNET_LAUNCH_PROFILE"];
         Assert.Equal("https", profileName);
 
-        // Wait for the application to be ready
-        await app.WaitForTextAsync("Application started.").WaitAsync(TimeSpan.FromMinutes(1));
+        // Wait for the application to be ready - must specify "mywebapp1" to avoid race condition
+        // where myworker1 logs "Application started." first
+        await app.WaitForTextAsync("Application started.", "mywebapp1").WaitAsync(TimeSpan.FromMinutes(1));
 
         // Explicitly get the HTTPS endpoint - this is only available on the "https" launch profile.
         var httpClient = app.CreateHttpClientWithResilience("mywebapp1", "https", opts =>