[EMCAL-1154] Adjust CellLabels for cross talk emulation

[mhemmer-cern]

• The CellLabel class used gsl::span as its members to store the mcLabels and amplitude fractions. However, when we want to use the cross talk emulation, we want to add new cells which happens inside the cross talk emulation function. Outside of this function the newley added CellLabels would point to dangling memory. That's why the members needed to be changed to std::vectors. Also a move constructor was added.

[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 70a163d at 2025-06-11 04:31:

## sw/BUILD/Rivet-latest/log
/sw/slc9_x86-64/YODA/yoda-2.1.0-3/include/YODA/highfive/H5Object.hpp:13:10: fatal error: H5Ipublic.h: No such file or directory
make[3]: *** [Makefile:563: libRivetCore_la-Run.lo] Error 1
make[3]: *** Waiting for unfinished jobs....
/sw/slc9_x86-64/YODA/yoda-2.1.0-3/include/YODA/highfive/H5Object.hpp:13:10: fatal error: H5Ipublic.h: No such file or directory
/sw/slc9_x86-64/YODA/yoda-2.1.0-3/include/YODA/highfive/H5Object.hpp:13:10: fatal error: H5Ipublic.h: No such file or directory
make[3]: *** [Makefile:619: libRivetCore_la-AnalysisLoader.lo] Error 1
make[3]: *** [Makefile:633: libRivetCore_la-AnalysisHandler.lo] Error 1
/sw/slc9_x86-64/YODA/yoda-2.1.0-3/include/YODA/highfive/H5Object.hpp:13:10: fatal error: H5Ipublic.h: No such file or directory
make[3]: *** [Makefile:612: libRivetCore_la-Analysis.lo] Error 1
make[2]: *** [Makefile:659: all-recursive] Error 1
make[1]: *** [Makefile:567: all-recursive] Error 1
make: *** [Makefile:578: all-recursive] Error 1

Full log here.

[alibuild]

Error while checking build/O2/fullCI_slc9 for 595d4c6 at 2025-06-14 12:48:

## sw/BUILD/O2Physics-latest/log
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:

Full log here.

[alibuild]

Error while checking build/O2/fullCI_slc9 for ef47962 at 2025-06-16 07:13:

## sw/BUILD/O2Physics-latest/log
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:

Full log here.

[jokonig]

looks good