[ExecuTorch][WebGPU] linear_q4gsw test suite: Llama-1B shapes + 4k/8k… #8044

Job	Run time
Get changed files / get-changed-files	2s
test-coreml / test-backend-macos (coreml, operators) / macos-job	12m 22s
test-coreml / test-backend-macos (coreml, models) / macos-job	13m 25s
test-coreml / test-backend-macos (coreml_static_int8, operators) / macos-job	3h 0m 47s
test-coreml / test-backend-macos (coreml_static_int8, models) / macos-job	25m 42s
test-coreml / test-backend-linux	0s
test-coreml / package-golden-artifacts	0s
	3h 52m 18s

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