Try to avoid building the fourmolu tests on macos

Author: michaelpj

.github/workflows/test.yml

@@ -173,7 +173,8 @@ jobs:
         name: Test hls-ormolu-plugin
         run: cabal test hls-ormolu-plugin-tests || cabal test hls-ormolu-plugin-tests
 
-      - if: matrix.test
+      # Disabled on macos until we find a workaround for https://gitlab.haskell.org/ghc/ghc/-/issues/24648
+      - if: matrix.test && matrix.os != 'macOS-latest'
         name: Test hls-fourmolu-plugin
         run: cabal test hls-fourmolu-plugin-tests || cabal test hls-fourmolu-plugin-tests
 

haskell-language-server.cabal

@@ -1481,7 +1481,9 @@ library hls-fourmolu-plugin
 
 test-suite hls-fourmolu-plugin-tests
   import:           defaults, pedantic, test-defaults, warnings
-  if !flag(fourmolu)
+  -- Disabled on macos until we find a workaround 
+  -- for https://gitlab.haskell.org/ghc/ghc/-/issues/24648
+  if !flag(fourmolu) || os(darwin)
     buildable: False
   type:             exitcode-stdio-1.0
   hs-source-dirs:   plugins/hls-fourmolu-plugin/test