Extend RecoContainer to support ITS and MFT cluster access per layer

[shahor02]

When per-layer input for ITS (MFT) clusters is expected, one should do:

1. Before calling DataRequest::requestITSClusters or batch methods calling this request, one should call DataRequest::setITSPerLayer(v=true) method.

2. Once RecoContainer::collectData was invoked, query clusters and related data via usual methods
   getITSClustersROFRecords, getITSClusters, getITSClustersPatterns, getITSClustersMCLabels with an extra argument (int layer=0).

Note that in case of old access mode (not per layer) the call to e.g. getITSClusters(0) and the equivalent getITSClusters() will return the usual flat span of clusters covering all layers.

[alibuild]

Error while checking build/O2/fullCI_slc9 for c1bf91f at 2026-09-29 01:24:

No log files found

Full log here.

[alibuild]

Error while checking build/O2/fullCI_slc9 for 4c57197 at 2026-09-29 01:24:

## sw/BUILD/O2-latest/log
/sw/SOURCES/O2/slc9_x86-64-slc9_x86-64/0/DataFormats/Detectors/GlobalTracking/src/RecoContainer.cxx:59:6: error: redefinition of 'void o2::globaltracking::DataRequest::setITSPerLayer(bool)'
/sw/SOURCES/O2/slc9_x86-64-slc9_x86-64/0/DataFormats/Detectors/GlobalTracking/src/RecoContainer.cxx:67:6: error: redefinition of 'void o2::globaltracking::DataRequest::setMFTPerLayer(bool)'
ninja: build stopped: subcommand failed.

Full log here.

[shahor02]

Verified that the old reconstruction results are fully preserved, merging.