[PWGEM] Remove unused file

[vkucera]

No description provided.

[alibuild]

Error while checking build/O2Physics/staging for d179e88 at 2026-05-07 11:18:

## sw/BUILD/O2Physics-latest/log
CMake Error at /sw/slc9_x86-64/CMake/v4.1.4-2/share/cmake-4.1/Modules/CMakeTestCCompiler.cmake:67 (message):
    2026-05-07T11:18:06.237+0200 [70:140429185990272] [buildboxcommon_grpcretrier.cpp:177] [ERROR] Retry limit (0) exceeded for "ActionCache.GetActionResult()", last gRPC error was [14: failed to connect to all addresses; last error: UNKNOWN: ipv4:127.0.0.1:8085: Failed to connect to remote host: Connection refused]
    2026-05-07T11:18:06.237+0200 [70:140429185990272] [executioncontext.cpp:544] [ERROR] Error while querying action cache at "http://localhost:8085": 14: failed to connect to all addresses; last error: UNKNOWN: ipv4:127.0.0.1:8085: Failed to connect to remote host: Connection refused
    2026-05-07T11:18:06.237+0200 [70:140429185990272] [buildboxcommon_grpcretrier.cpp:177] [ERROR] Retry limit (0) exceeded for "FindMissingBlobs()", last gRPC error was [14: failed to connect to all addresses; last error: UNKNOWN: ipv6:%5B::1%5D:8085: Failed to connect to remote host: Connection refused]
    2026-05-07T11:18:06.238+0200 [70:140429185990272] [executioncontext.cpp:908] [ERROR] Error while uploading resources to CAS at "http://localhost:8085": 14: failed to connect to all addresses; last error: UNKNOWN: ipv6:%5B::1%5D:8085: Failed to connect to remote host: Connection refused
    ninja: build stopped: subcommand failed.

Full log here.