[CIR] Add mlir-translate to CMake (#146608)
This PR adds the `mlir-translate` dependency to CIR.
The following test was failing when running `ninja check-clang-cir`:
```
CIR/Lowering/stack-save-restore.cir
line 2: mlir-translate: command not found
```
The failure occurred because `mlir-translate` was not being built as
part of the CIR test dependencies. This PR ensures that the target is
properly built so the test can run successfully.
