[ALICE3] Add V3 magnet map

[njacazio]

No description provided.

[github-actions]

REQUEST FOR PRODUCTION RELEASES:
To request your PR to be included in production software, please add the corresponding labels called "async-" to your PR. Add the labels directly (if you have the permissions) or add a comment of the form (note that labels are separated by a ",")

+async-label <label1>, <label2>, !<label3> ...

This will add <label1> and <label2> and removes <label3>.

The following labels are available
async-2023-pbpb-apass4
async-2023-pp-apass4
async-2024-pp-apass1
async-2022-pp-apass7
async-2024-pp-cpass0
async-2024-PbPb-apass1
async-2024-ppRef-apass1
async-2024-PbPb-apass2
async-2023-PbPb-apass5

[alibuild]

Error while checking build/O2/fullCI_slc9 for 1be69b5 at 2026-04-15 17:31:

## sw/BUILD/O2-full-system-test-latest/log
command /sw/slc9_x86-64/O2/slc9_x86-64-slc9_x86-64-local9/prodtests/full-system-test/dpl-workflow.sh had nonzero exit code 1
[8795:BadMapCalibSpec]: [17:30:35][ERROR] Insufficient statistics: 0 entries in lowE histo, do nothing
[9203:qc-task-ITS-ITSTrackTask]: [17:31:01][ERROR] Exception while running: Inconsistent type and payload size at Vertices(DS/tracks1/0): type size 48  payload size 260. Rethrowing.
[9203:qc-task-ITS-ITSTrackTask]: [17:31:01][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 260
[ERROR] Workflow crashed - PID 9203 (qc-task-ITS-ITSTrackTask) did not exit correctly however it's not clear why. Exit code forced to 128.
[9098:o2-eve-export]: [17:31:06][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 9203 (exit 128)
[INFO]    - First error: [17:31:01][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 260
[ERROR] SEVERE: Device qc-task-ITS-ITSTrackTask (9203) 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 260

Full log here.