[mlir][bazel] Fix no-allow-shlib-undefined errors.

The BUILD file changes in #127544 adds `LinalgInterfaces` which is incomplete without `LinalgDialect`.

For now, just add the `LinalgDialect` as dependency to tests which do not otherwise depend on it (but depend on `LinalgInterfaces` through e.g. `TensorDialect`).

This is a temporary solution until the dependency of `TensorDialect` is trimmed to just the `linalg::RelayoutOpInterface`, but not the other linalg interfaces. See #127544 (review).

utils/bazel/llvm-project-overlay/mlir/unittests/BUILD.bazel

@@ -176,6 +176,7 @@ cc_test(
         "//mlir:ArithDialect",
         "//mlir:FuncDialect",
         "//mlir:IR",
+        "//mlir:LinalgDialect",
         "//mlir:Parser",
         "//mlir:SCFDialect",
         "//mlir:SideEffectInterfaces",
@@ -211,6 +212,7 @@ cc_test(
         "//llvm:Support",
         "//llvm:TestingSupport",
         "//mlir:IR",
+        "//mlir:LinalgDialect",
         "//mlir:SPIRVBinaryUtils",
         "//mlir:SPIRVDeserialization",
         "//mlir:SPIRVDialect",