[PWGDQ] implementing a posteriori 3D vertex shift for forward tracks

[mcoquet642]

No description provided.

[github-actions]

O2 linter results: ❌ 111 errors, ⚠️ 732 warnings, 🔕 0 disabled

[alibuild]

Error while checking build/O2Physics/code-check for 18a6cae at 2026-08-02 12:36:

## sw/BUILD/O2Physics-latest/log
2026-08-02T09:55:23.274+0200 [35854:139623900151424] [buildboxcommon_grpcretrier.cpp:177] [ERROR] Retry limit (0) exceeded for "ByteStream.Read()", last gRPC error was [14: recvmsg:Connection reset by peer]
2026-08-02T09:55:23.279+0200 [35854:139623900151424] [executioncontext.cpp:739] [ERROR] Failed to download output blob d6425f3b6372dde3d3ab045c7705c23f477e8ab7c187af2fe0e941a21bfacbf3: 14: recvmsg:Connection reset by peer
2026-08-02T09:55:24.676+0200 [35730:140270983843456] [buildboxcommon_grpcretrier.cpp:177] [ERROR] Retry limit (0) exceeded for "ByteStream.Read()", last gRPC error was [14: Socket closed]
2026-08-02T09:55:24.679+0200 [35730:140270983843456] [executioncontext.cpp:739] [ERROR] Failed to download output blob 5289d3ea450059e459b502c0967c9706b017a694a86b9765341d6c6c193fead0: 14: Socket closed
2026-08-02T09:55:39.744+0200 [35968:139741010878080] [buildboxcommon_grpcretrier.cpp:177] [ERROR] Retry limit (0) exceeded for "ByteStream.Read()", last gRPC error was [14: Socket closed]
2026-08-02T09:55:39.749+0200 [35968:139741010878080] [executioncontext.cpp:739] [ERROR] Failed to download output blob 01f202f6cef40469175545355b0967f56c2779dea6659f2e140ad2382d19ed34: 14: Socket closed
2026-08-02T09:55:42.340+0200 [35989:139887277043328] [buildboxcommon_grpcretrier.cpp:177] [ERROR] Retry limit (0) exceeded for "ByteStream.Read()", last gRPC error was [14: Socket closed]
2026-08-02T09:55:42.628+0200 [35989:139887277043328] [executioncontext.cpp:739] [ERROR] Failed to download output blob d3f451a0ef96769134209d7110cf19ab25eecb9e39c2c45cd481fadcc0254070: 14: Socket closed
2026-08-02T11:38:12.973+0200 [35803:139706661731968] [buildboxcommon_grpcretrier.cpp:177] [ERROR] Retry limit (0) exceeded for "ByteStream.Read()", last gRPC error was [14: Socket closed]
2026-08-02T11:38:12.978+0200 [35803:139706661731968] [executioncontext.cpp:739] [ERROR] Failed to download output blob e0eb01c918905d72cf0943f123a05ade80617cd2a3b6521804a3a89c0a008fee: 14: Socket closed

Full log here.