[mlir][cmake] Add missing MLIRTestDialect dependencies

This cherry picks
[mlir] Fix build race condition in Pass Manager tests (d906da5)
to the 20.x release branch.

This addresses issues that started with
#123910, which is already on the 20.x branch.

Linaro noticed this on our flang dylib (shared library) build bot.

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"
      |          ^~~~~~~~~~~~~~~

We have tested these changes on the buildbot for the last 2 days and had no problems.
Whereas before it was failing maybe 1 in 10 builds, enough that multiple people
in the community noticed it.

Reported in #124485.

Author: dcaballe

mlir/test/lib/Pass/CMakeLists.txt

@@ -10,12 +10,14 @@ 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
   MLIRPass
-  MLIRTestDialect
   )
 
 target_include_directories(MLIRTestPass