Add release note for App2App (#993)

Author: MatKuhr

cloudplatform/connectivity-oauth/src/test/java/com/sap/cloud/sdk/cloudplatform/connectivity/BtpServicePropertySuppliersTest.java

@@ -587,12 +587,17 @@ void testClientIdWithTenantId()
                             "urn:sap:identity:consumer:clientid:client-id:apptid:tenant-id",
                             "app_tid",
                             PROVIDER_TENANT_ID));
+            /*
+             * Note: having two different apptid values here is intentional.
+             * The first one is the tenant ID used by the target system.
+             * The second one is the tenant ID of the current application.
+             * While they can be the same, they do not have to be.
+             */
         }
 
         @Test
         void testProviderClientId()
         {
-            @SuppressWarnings( "deprecation" )
             final ServiceBindingDestinationOptions options =
                 ServiceBindingDestinationOptions
                     .forService(BINDING)
@@ -622,7 +627,6 @@ void testProviderClientId()
         @Test
         void testProviderClientIdWithTenantId()
         {
-            @SuppressWarnings( "deprecation" )
             final ServiceBindingDestinationOptions options =
                 ServiceBindingDestinationOptions
                     .forService(BINDING)

release_notes.md

@@ -13,6 +13,8 @@
 ### ✨ New Functionality
 
 - Add support for using the Zero Trust Identity Service (ZTIS) on Kyma by detecting the [well-known environment variable `SPIFFE_ENDPOINT_SOCKET`](https://github.com/spiffe/spiffe/blob/main/standards/SPIFFE_Workload_Endpoint.md#4-locating-the-endpoint).
+- Add support for explicitly passing the `clientid` of the target system when using the IAS App2App authentication flow.
+  Use the new methods `withProviderClient(clientid)` and `withProviderClient(clientid, apptid)` under `BtpServiceOptions.IasOptions`.
 
 ### 📈 Improvements