fix(tracing): use agentId as span reference_id #5386

Job	Run time
detect-changed-packages	6s
discover-testcases	6s
apicalls-testcase / alpha	39s
apicalls-testcase / staging	40s
basic-testcase / cloud	32s
basic-testcase / staging	38s
calculator-evals / cloud	3m 16s
calculator-evals / alpha	3m 10s
calculator-crash-evals / staging	31s
eval-spans-testcase / alpha	1m 26s
apicalls-testcase / cloud	48s
eval-level-expected-output / alpha	40s
langchain-cross / cloud	43s
csv-processor-evals / cloud	36s
basic-testcase / alpha	46s
eval-level-expected-output / staging	42s
eval-input-overrides / alpha	30s
eval-input-overrides / staging	36s
eval-spans-testcase / cloud	1m 15s
calculator-crash-evals / alpha	31s
eval-telemetry-testcase / staging	2m 26s
langchain-cross / staging	40s
eval-input-overrides / cloud	35s
tools-evals / staging	49s
target-output-key-evals / alpha	30s
tools-evals / cloud	44s
target-output-key-evals / cloud	35s
calculator-crash-evals / cloud	51s
eval-spans-testcase / staging	1m 29s
target-output-key-evals / staging	32s
csv-processor-evals / alpha	31s
simulation-testcase / cloud	38s
csv-processor-evals / staging	32s
tools-evals / alpha	44s
simulation-testcase / staging	42s
calculator-evals / staging	6m 8s
langchain-cross / alpha	44s
eval-level-expected-output / cloud	42s
eval-telemetry-testcase / alpha	1m 47s
eval-telemetry-testcase / cloud	1m 43s
simulation-testcase / alpha	34s
summarize-results	4s
	42m 11s

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