coin: Make macOS nightly reference existing macOS configurations

Change-Id: I8e4d7da2a3293d649f2af0dc978c9be2bfd5726c
Reviewed-by: Toni Saario <toni.saario@qt.io>

coin/platform_configs/nightly_macos.yaml

@@ -1,25 +1,14 @@
 Version: 2
 Module only: True
+
+# Please add nightly/beta configs to macos.yaml with the appropriate
+# COIN_CTEST_IGNORE_EXIT_CODE to make it insignificant.
+
 Include: [
     macos.yaml: [
-        'macos-universal-on-arm64'
+        'macos-universal-on-arm64',
+        'macos-26-arm64-tests',
+        'macos-26-arm64-developer-build',
+        'macos-26-arm64-developer-build-tests'
     ],
 ]
-Configurations:
--
-    Id: 'macos-26-arm64-developer-build'
-    Template: 'qtci-macos-26-arm-101'
-    Compiler: 'Clang'
-    Features: ['Sccache', 'WarningsAreErrors', 'UseConfigure']
-    Configure arguments: '-developer-build -release -force-debug-info -no-pch -no-framework -qtnamespace TestNamespace -nomake examples -nomake tests'
-    Environment variables: [
-        # FIXME: macOS 15 ARM VMs have trouble attaching to test via lldb
-        'QTEST_DISABLE_STACK_DUMP=1'
-    ]
-
--
-    Id: 'macos-26-arm64-tests'
-    Template: 'qtci-macos-26-arm-101'
-    Compiler: 'Clang'
-    Features: ['TestOnly', 'Packaging', 'Insignificant', 'Insignificant']
-    Platform dependency: 'macos-universal-on-arm64'