[js/webgpu] exclude WebGPU reduce_log_sum_exp_* float64 test cases (#17472)
### Description
as explained in the comments, tests "test_reduce_log_sum_exp_*" on
opset17/opset18 are excluded because they use float64.
They are passing now because they fallback to CPU. WebGPU does not
support f64.
This is one of the prerequisites for supporting IO binding for WebGPU
buffer in onnxruntime-web.
list of prerequisites PRs:
https://github.com/microsoft/onnxruntime/pull/17465
https://github.com/microsoft/onnxruntime/pull/17469
https://github.com/microsoft/onnxruntime/pull/17470
https://github.com/microsoft/onnxruntime/pull/17472 (this one)