[mlir] Fix build race condition in Pass Manager tests

That Linaro has been seeing on our dylib bot:
https://lab.llvm.org/staging/#/builders/171/builds/79

In file included from /home/tcwg-buildbot/worker/flang-aarch64-dylib/llvm-project/mlir/test/lib/Pass/TestPassManager.cpp:10:
/home/tcwg-buildbot/worker/flang-aarch64-dylib/llvm-project/mlir/test/lib/Pass/../Dialect/Test/TestOps.h:148:10: fatal error: 'TestOps.h.inc' file not found
  148 | #include "TestOps.h.inc"
      |          ^~~~~~~~~~~~~~~

Reported in llvm#124335 and
llvm#124485.

I think this was caused by llvm#123910,
and so I've followed what llvm#125004 did,
which seems to be a follow up to that. Same kind of error.

I was not able to reproduce the failure locally, but dylib and
normal builds are ok with this change so I will push it and monitor
the bot's results for a few days.

Author: DavidSpickett

mlir/test/lib/Pass/CMakeLists.txt

@@ -11,13 +11,15 @@ add_mlir_library(MLIRTestPass
 
   ADDITIONAL_HEADER_DIRS
   ${MLIR_MAIN_INCLUDE_DIR}/mlir/Pass
+
+  LINK_LIBS PUBLIC
+  MLIRTestDialect
   )
 mlir_target_link_libraries(MLIRTestPass PUBLIC
   ${conversion_libs}
   MLIRIR
   MLIRSPIRVTransforms
   MLIRPass
-  MLIRTestDialect
   )
 
 target_include_directories(MLIRTestPass