FastMultEst does not need to be streamed

[mpuccio]

No description provided.

[alibuild]

Error while checking build/O2/fullCI_slc9 for f08b0bf at 2026-04-14 10:34:

## sw/BUILD/O2-full-system-test-latest/log
command /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local8/prodtests/full-system-test/dpl-workflow.sh had nonzero exit code 1
[8750:BadMapCalibSpec]: [10:33:46][ERROR] Insufficient statistics: 1 entries in lowE histo, do nothing
[9284:qc-task-ITS-ITSTrackTask]: [10:34:10][ERROR] Exception while running: Inconsistent type and payload size at Vertices(DS/tracks1/0): type size 48  payload size 312. Rethrowing.
[9284:qc-task-ITS-ITSTrackTask]: [10:34:10][FATAL] Unhandled o2::framework::runtime_error reached the top of main of o2-qc, device shutting down. Reason: Inconsistent type and payload size at Vertices(DS/tracks1/0): type size 48  payload size 312
[ERROR] Workflow crashed - PID 9284 (qc-task-ITS-ITSTrackTask) did not exit correctly however it's not clear why. Exit code forced to 128.
[9148:o2-eve-export]: [10:34:15][ERROR] filesystem problem during DirectoryLoader::canCreateNextFile: filesystem error: directory iterator cannot open directory: No such file or directory [jsons]
[ERROR]  - Device qc-task-ITS-ITSTrackTask: pid 9284 (exit 128)
[INFO]    - First error: [10:34:10][FATAL] Unhandled o2::framework::runtime_error reached the top of main of o2-qc, device shutting down. Reason: Inconsistent type and payload size at Vertices(DS/tracks1/0): type size 48  payload size 312
[ERROR] SEVERE: Device qc-task-ITS-ITSTrackTask (9284) had at least one message above severity 7: Unhandled o2::framework::runtime_error reached the top of main of o2-qc, device shutting down. Reason: Inconsistent type and payload size at Vertices(DS/tracks1/0): type size 48  payload size 312


## sw/BUILD/o2checkcode-latest/log
--
========== List of errors found ==========
++ GRERR=0
++ grep -v clang-diagnostic-error error-log.txt
++ grep ' error:'
++ GRERR=1
++ [[ 1 == 0 ]]
++ mkdir -p /sw/INSTALLROOT/64aaa2ad00299ccb3485cd8608c725f8f83bd11c/slc9_x86-64/o2checkcode/1.0-local377/etc/modulefiles
++ cat
--

Full log here.

[f3sch]

@shahor02 can we merge this otherwise the build the build on latest macOS breaks, thanks