fix: pack reads files in binary mode to prevent trimming on Windows #4126

Job	Run time
discover-testcases	3s
calculator-crash-evals / staging	32s
calculator-crash-evals / cloud	35s
eval-input-overrides / staging	26s
apicalls-testcase / alpha	41s
calculator-evals / alpha	3m 25s
eval-level-expected-output / staging	37s
basic-testcase / alpha	33s
eval-level-expected-output / cloud	37s
apicalls-testcase / cloud	36s
apicalls-testcase / staging	40s
calculator-crash-evals / alpha	35s
csv-processor-evals / alpha	38s
basic-testcase / cloud	31s
csv-processor-evals / cloud	34s
calculator-evals / cloud	3m 14s
csv-processor-evals / staging	31s
basic-testcase / staging	31s
eval-spans-testcase / alpha	1m 20s
eval-level-expected-output / alpha	36s
eval-input-overrides / alpha	34s
langchain-cross / alpha	34s
eval-input-overrides / cloud	29s
target-output-key-evals / staging	34s
target-output-key-evals / cloud	36s
eval-spans-testcase / cloud	1m 17s
langchain-cross / cloud	34s
eval-spans-testcase / staging	1m 25s
tools-evals / cloud	42s
target-output-key-evals / alpha	27s
tools-evals / alpha	49s
eval-telemetry-testcase / staging	1m 49s
tools-evals / staging	39s
eval-telemetry-testcase / alpha	2m 0s
calculator-evals / staging	3m 23s
langchain-cross / staging	35s
eval-telemetry-testcase / cloud	1m 49s
summarize-results	3s
	35m 34s

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