Enable splice plugin in Cabal files and CI

Author: eddiejessup

.github/workflows/test.yml

@@ -186,7 +186,7 @@ jobs:
         name: Test hls-haddock-comments-plugin
         run: cabal test hls-haddock-comments-plugin --test-options="$TEST_OPTS" || cabal test hls-haddock-comments-plugin --test-options="$TEST_OPTS" || LSP_TEST_LOG_COLOR=0 LSP_TEST_LOG_MESSAGES=true LSP_TEST_LOG_STDERR=true cabal test hls-haddock-comments-plugin --test-options="$TEST_OPTS"
 
-      - if: matrix.test && matrix.ghc != '9.2.2'
+      - if: matrix.test
         name: Test hls-splice-plugin
         run: cabal test hls-splice-plugin --test-options="$TEST_OPTS" || cabal test hls-splice-plugin --test-options="$TEST_OPTS" || LSP_TEST_LOG_COLOR=0 LSP_TEST_LOG_MESSAGES=true LSP_TEST_LOG_STDERR=true cabal test hls-splice-plugin --test-options="$TEST_OPTS"
 

cabal-ghc92.project

@@ -49,7 +49,6 @@ constraints:
     -haddockComments
     -hlint
     -retrie
-    -splice
     -stylishhaskell
     -tactic,