[CI] Benchmark CI broken in main branch

[marcalff]

The benchmark CI is broken with the following error:

BENCHMARK result (end)
gojq: invalid json: <stdin>:509
Warning:      }[Warning] File: sdk/src/metrics/meter.cc:719 [Meter::WarnOnD
               ^  invalid character '[' after array element
Error: Process completed with exit code 5.

This appeared after the merge of:

• [TEST] Add multi-threaded metrics benchmarks: shared vs per-thread counter #3898