Set proper EOR to anchored MC GRPECS

[dstocco]

This is a follow-up of #14839
The issue seems to be still there when launching a simulation with o2sim. This PR allows to properly set the EOR also in o2sim.
@shahor02 @sawenzel

[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 d5be1e7 at 2025-11-22 17:26:

## sw/BUILD/O2-latest/log
CMake Error at /sw/slc9_x86-64/CMake/v3.31.6-6/share/cmake-3.31/Modules/FindPackageHandleStandardArgs.cmake:233 (message):

Full log here.