Fix 'occured' -> 'occurred' typos in backends and exir tracer (#18905) #2576

Job	Run time
test-xnnpack / test-backend-linux (xnnpack, operators) / linux-job	15m 15s
test-xnnpack / test-backend-linux (xnnpack_dynamic_int8_per_channel, models) / linux-job	19m 43s
test-xnnpack / test-backend-linux (xnnpack_static_int8_per_tensor, models) / linux-job	22m 52s
test-xnnpack / test-backend-linux (xnnpack_static_int8_per_tensor, operators) / linux-job	26m 44s
test-xnnpack / test-backend-linux (xnnpack_static_int8_per_channel, models) / linux-job	28m 49s
test-xnnpack / test-backend-linux (xnnpack_dynamic_int8_per_channel, operators) / linux-job	18m 40s
test-xnnpack / test-backend-linux (xnnpack, models) / linux-job	51m 32s
test-xnnpack / test-backend-linux (xnnpack_static_int8_per_channel, operators) / linux-job	26m 50s
test-xnnpack / test-backend-macos	0s
test-xnnpack / package-golden-artifacts	5m 29s
	3h 35m 54s

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