fix(jobs): allow null folder_key on Job model #5388

Job	Run time
detect-changed-packages	9s
discover-testcases	4s
apicalls-testcase / alpha	46s
basic-testcase / cloud	47s
apicalls-testcase / staging	42s
calculator-crash-evals / staging	42s
calculator-crash-evals / alpha	54s
apicalls-testcase / cloud	1m 5s
eval-spans-testcase / staging	1m 24s
csv-processor-evals / alpha	29s
eval-level-expected-output / alpha	40s
eval-input-overrides / cloud	56s
eval-spans-testcase / alpha	1m 44s
calculator-crash-evals / cloud	1m 0s
eval-telemetry-testcase / staging	1m 57s
eval-level-expected-output / cloud	36s
basic-testcase / staging	31s
eval-input-overrides / alpha	30s
langchain-cross / cloud	42s
eval-spans-testcase / cloud	1m 37s
simulation-testcase / alpha	34s
langchain-cross / alpha	1m 19s
eval-telemetry-testcase / alpha	2m 2s
target-output-key-evals / alpha	52s
langchain-cross / staging	1m 11s
simulation-testcase / cloud	47s
csv-processor-evals / staging	52s
calculator-evals / staging	3m 29s
eval-level-expected-output / staging	53s
eval-input-overrides / staging	31s
simulation-testcase / staging	38s
eval-telemetry-testcase / cloud	1m 47s
basic-testcase / alpha	38s
csv-processor-evals / cloud	1m 28s
calculator-evals / alpha	3m 29s
target-output-key-evals / cloud	34s
calculator-evals / cloud	3m 7s
target-output-key-evals / staging	1m 14s
tools-evals / cloud	1m 3s
tools-evals / alpha	1m 26s
tools-evals / staging	46s
summarize-results	3s
	45m 58s

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