coin: Remove macOS 11 x86_64 developer build and arm64 packaging tests

We're running out of capacity for macOS 11 nodes, so let's reduce the
test coverage, now that macOS 11 is no longer a primary platform.

It's still supported, so we keep one x86_64 and one arm64 config.

Change-Id: I3fc4c3a12967b937ef59fd190074dac30dedd2be
Reviewed-by: Ville-Pekka Karhu <ville-pekka.karhu@qt.io>

coin/platform_configs/macos.yaml

@@ -64,12 +64,6 @@ Configurations:
 
     # And arm64
 
-    -
-        Id: 'macos-11-arm64-tests'
-        Template: 'qtci-macos-11.0-arm64'
-        Compiler: 'Clang'
-        Features: ['Sccache', 'TestOnly', 'Packaging']
-        Platform dependency: 'macos-universal-on-x86_64'
     -
         Id: 'macos-12-arm64-tests'
         Template: 'qtci-macos-12-arm64'
@@ -147,12 +141,6 @@ Configurations:
 
     # Test on all supported macOS versions (deployment targets)
 
-    -
-        Id: 'macos-11-x86_64-developer-build-tests'
-        Template: 'qtci-macos-11-x86_64-106'
-        Compiler: 'Clang'
-        Features: ['Sccache', 'TestOnly']
-        Platform dependency: 'macos-13-x86_64-developer-build'
     -
         Id: 'macos-11-arm64-developer-build-tests'
         Template: 'qtci-macos-11.0-arm64'