Add friendly name comments to GUIDs per PR feedback

- Added app name 'MSAL-APP-AzureADMultipleOrgs' and 'ID4SLAB1 tenant' comments to migrated GUIDs
- Added 'MSIDLAB4 tenant (legacy)' comments to legacy GUIDs for clarity
- Addresses Gladwin's PR feedback to document GUID purposes for better code readability

Files updated:
- TestConstants.cs: Added comments to ClientCredentialAudience and PublicCloudConfidentialClientID
- ConfidentialAppSettings.cs: Added comments to both new ID4SLAB1 and legacy MSIDLAB4 GUIDs
- FmiIntegrationTests.cs: Updated legacy tenant ID comment

Author: RyAuld

tests/Microsoft.Identity.Test.Common/TestConstants.cs

@@ -32,8 +32,8 @@ public static HashSet<string> s_scope
         public const string MsiResource = "scope";
         public static readonly string[] s_graphScopes = new[] { "user.read" };
         public const uint JwtToAadLifetimeInSeconds = 60 * 10; // Ten minutes
-        public const string ClientCredentialAudience = "https://login.microsoftonline.com/10c419d4-4a50-45b2-aa4e-919fb84df24f/v2.0";
-        public const string PublicCloudConfidentialClientID = "54a2d933-8bf8-483b-a8f8-0a31924f3c1f";
+        public const string ClientCredentialAudience = "https://login.microsoftonline.com/10c419d4-4a50-45b2-aa4e-919fb84df24f/v2.0"; // ID4SLAB1 tenant
+        public const string PublicCloudConfidentialClientID = "54a2d933-8bf8-483b-a8f8-0a31924f3c1f"; // MSAL-APP-AzureADMultipleOrgs in ID4SLAB1 tenant
         public const string AutomationTestCertName = "LabAuth.MSIDLab.com";
         public static Dictionary<string, string> AdditionalAssertionClaims =>
             new Dictionary<string, string>() { { "Key1", "Val1" }, { "Key2", "Val2" }, { "customClaims", "{\"xms_az_claim\": [\"GUID\", \"GUID2\", \"GUID3\"]}" } };

tests/Microsoft.Identity.Test.Integration.netcore/HeadlessTests/FmiIntegrationTests.cs

@@ -29,7 +29,7 @@ public class FmiIntegrationTests
         private const string Testslice = "dc=ESTSR-PUB-WUS-LZ1-TEST"; //Updated slice for regional tests
         private Dictionary<string, (string, bool)> TestsliceQueryParam = new Dictionary<string, (string value, bool includeInCacheKey)> { { "dc", ("ESTSR-PUB-WUS-LZ1-TEST", false) } };
         private const string AzureRegion = "westus3";
-        private const string TenantId = "f645ad92-e38d-4d1a-b510-d1b09a74a8ca"; //Tenant Id for the test app
+        private const string TenantId = "f645ad92-e38d-4d1a-b510-d1b09a74a8ca"; // MSIDLAB4 tenant (legacy)
 
         [TestMethod]
         //RMA getting FMI cred for a leaf entity or sub-RMA

tests/Microsoft.Identity.Test.Integration.netcore/Infrastructure/ConfidentialAppSettings.cs

@@ -40,9 +40,9 @@ private class PublicCloudConfidentialAppSettings : IConfidentialAppSettings
         {
             // TODO: Tenant Migration - Migrated to new id4slab1 tenant for non-regional tests
             // Regional tests still use legacy configuration due to AADSTS100007 restrictions
-            public string ClientId => UseAppIdUri? "api://54a2d933-8bf8-483b-a8f8-0a31924f3c1f" : "54a2d933-8bf8-483b-a8f8-0a31924f3c1f";
+            public string ClientId => UseAppIdUri? "api://54a2d933-8bf8-483b-a8f8-0a31924f3c1f" : "54a2d933-8bf8-483b-a8f8-0a31924f3c1f"; // MSAL-APP-AzureADMultipleOrgs in ID4SLAB1 tenant
 
-            public string TenantId => "10c419d4-4a50-45b2-aa4e-919fb84df24f";
+            public string TenantId => "10c419d4-4a50-45b2-aa4e-919fb84df24f"; // ID4SLAB1 tenant
 
             public string Environment => "login.microsoftonline.com";
 
@@ -148,9 +148,9 @@ private class PublicLegacyCloudConfidentialAppSettings : IConfidentialAppSetting
         {
             // Legacy MSIDLAB4 configuration for regional tests only
             // Regional endpoints require original tenant due to AADSTS100007 restrictions
-            public string ClientId => UseAppIdUri? "api://88f91eac-c606-4c67-a0e2-a5e8a186854f" : "88f91eac-c606-4c67-a0e2-a5e8a186854f";
+            public string ClientId => UseAppIdUri? "api://88f91eac-c606-4c67-a0e2-a5e8a186854f" : "88f91eac-c606-4c67-a0e2-a5e8a186854f"; // Legacy MSAL app in MSIDLAB4 tenant
 
-            public string TenantId => "f645ad92-e38d-4d1a-b510-d1b09a74a8ca";
+            public string TenantId => "f645ad92-e38d-4d1a-b510-d1b09a74a8ca"; // MSIDLAB4 tenant (legacy)
 
             public string Environment => "login.microsoftonline.com";