[CK_BUILDER] Fix two staging-compiler errors in CK builder code (#4598)

This PR fixes two compiler warnings that report as errors with the
latest compiler:

1. In tensor descriptor, the `operator[]` accessor needs a
`[[clang::lifetimebound]]` attribute.
2. In the unit tests for device buffer, there is a test that explicitly
checks for an error on a pointer that went out of scope, so it needs a
to disable `-Wlifetime-safety-permissive` in the test code.

I ran the CK `smoke-builder` tests with the staging compiler to verify.

---------

Co-authored-by: illsilin_amdeng <Illia.Silin@amd.com>

experimental/builder/include/ck_tile/builder/testing/tensor_descriptor.hpp

@@ -106,7 +106,7 @@ struct Extent : std::array<size_t, RANK>
     /// @param i The index to index the array with.
     ///
     /// @see std::array::operator[]
-    __device__ __host__ size_t& operator[](size_t i)
+    __device__ __host__ size_t& operator[](size_t i) [[clang::lifetimebound]]
     {
         if constexpr(RANK > 0)
         {
@@ -450,7 +450,8 @@ struct TensorDescriptor
     /// @brief Print tensor descriptor details.
     ///
     /// Print tensor descriptor details - lengths and strides.
-    friend std::ostream& operator<<(std::ostream& os, const TensorDescriptor<DT, RANK>& tensor_desc)
+    friend std::ostream& operator<<([[clang::lifetimebound]] std::ostream& os,
+                                    const TensorDescriptor<DT, RANK>& tensor_desc)
     {
         os << tensor_desc.inner_descriptor_;
         return os;