backport of the PR #24613 and #24902: RPC digi merger and test new readouts

[slezki]

This is essentially two requests for two backports of PRs:
Firstly, need to backport the PR: #24613
Secondly, need to backport the PR: #24902

the second PR (#24902) is to test new readouts by using new RPC digi merger in PR: #24613.

[cmsbuild]

A new Pull Request was created by @slezki for CMSSW_10_3_X.

It involves the following packages:

Alignment/CommonAlignment
Alignment/CommonAlignmentMonitor
Alignment/CommonAlignmentProducer
Alignment/MuonAlignment
Alignment/OfflineValidation
Alignment/TrackerAlignment
CalibCalorimetry/EcalTPGTools
CalibCalorimetry/HcalAlgos
CalibCalorimetry/HcalPlugins
CalibCalorimetry/HcalTPGAlgos
CalibCalorimetry/HcalTPGEventSetup
Calibration/HcalCalibAlgos
Calibration/TkAlCaRecoProducers
CaloOnlineTools/HcalOnlineDb
CommonTools/UtilAlgos
CondFormats/Alignment
CondFormats/CSCObjects
CondFormats/CTPPSReadoutObjects
CondFormats/HcalObjects
CondFormats/PhysicsToolsObjects
CondFormats/Serialization
CondFormats/SiPixelObjects
Configuration/Generator
Configuration/Geometry
Configuration/PyReleaseValidation
Configuration/StandardSequences
DQM/HcalTasks
DQM/Integration
DQMOffline/EGamma
DQMOffline/Ecal
DQMOffline/JetMET
DQMOffline/L1Trigger
DQMOffline/RecoB
DataFormats/BTauReco
DataFormats/GsfTrackReco
DataFormats/HcalRecHit
DataFormats/TrackReco
DetectorDescription/Core
DetectorDescription/RegressionTest
EventFilter/CSCTFRawToDigi
EventFilter/CTPPSRawToDigi
EventFilter/RPCRawToDigi
EventFilter/RawDataCollector
FWCore/Framework
FWCore/Integration
FWCore/MessageLogger
FWCore/ParameterSet
FWCore/ParameterSetReader
FWCore/PythonParameterSet
FWCore/ServiceRegistry
FWCore/Skeletons
FWCore/TestProcessor
FWCore/Utilities
FastSimDataFormats/L1GlobalMuonTrigger
FastSimulation/Configuration
FastSimulation/ParticleDecay
FastSimulation/TrackingRecHitProducer
Fireworks/FWInterface
GeneratorInterface/Core
GeneratorInterface/Pythia8Interface
GeneratorInterface/RivetInterface
Geometry/CMSCommonData
Geometry/CSCGeometryBuilder
Geometry/DTGeometryBuilder
Geometry/ForwardCommonData
Geometry/HGCalCommonData
Geometry/MTDNumberingBuilder
Geometry/MuonCommonData
Geometry/TrackerNumberingBuilder
IOPool/Common
IOPool/Input
L1Trigger/CSCTriggerPrimitives
L1Trigger/Configuration
L1Trigger/GlobalCaloTrigger
L1Trigger/L1TCalorimeter
L1Trigger/L1TMuonEndCap
L1Trigger/RPCTrigger
L1TriggerConfig/L1TConfigProducers
PhysicsTools/CondLiteIO
PhysicsTools/FWLite
PhysicsTools/MVATrainer
PhysicsTools/PatExamples
PhysicsTools/SelectorUtils
PhysicsTools/UtilAlgos
PhysicsTools/Utilities
RecoBTag/SecondaryVertex
RecoBTau/JetTagComputer
RecoEcal/EgammaClusterAlgos
RecoEcal/EgammaClusterProducers
RecoEcal/EgammaCoreTools
RecoEgamma/EgammaElectronAlgos
RecoEgamma/EgammaPhotonAlgos
RecoLocalCalo/HGCalRecProducers
RecoLocalCalo/HcalRecAlgos
RecoLocalCalo/HcalRecProducers
RecoLocalMuon/Configuration
RecoLocalMuon/RPCRecHit
RecoMuon/L3MuonProducer
RecoMuon/TrackingTools
RecoParticleFlow/PFProducer
RecoParticleFlow/PFSimProducer
RecoTauTag/RecoTau
RecoTracker/DebugTools
RecoTracker/TkDetLayers
RecoTracker/TkNavigation
RecoTracker/TkSeedGenerator
RecoTracker/TkTrackingRegions
RecoVertex/GhostTrackFitter
SUSYBSMAnalysis/HSCP
SimCalorimetry/HcalTrigPrimAlgos
SimCalorimetry/HcalTrigPrimProducers
SimG4CMS/Calo
SimG4Core/Application
SimG4Core/CustomPhysics
TrackingTools/DetLayers
Utilities/General
Validation/Geometry
Validation/HGCalValidation
Validation/RecoB
Validation/RecoTau

@andrius-k, @lveldere, @emeschi, @schneiml, @ianna, @kpedro88, @nsmith-, @rekovic, @thomreis, @alberto-sanchez, @pohsun, @arizzi, @perrotta, @civanch, @zhenhu, @cmsbuild, @fwyzard, @davidlange6, @smuzaffar, @Dr15Jones, @cvuosalo, @efeyazgan, @mdhildreth, @gpetruc, @jfernan2, @tocheng, @slava77, @ggovi, @qliphy, @fabiocos, @ssekmen, @Martin-Grunewald, @prebello, @kmaeshima, @perrozzi, @monttj, @pgunnell, @alja, @franzoni, @mommsen, @lpernie can you please review it and eventually sign? Thanks.
@TaiSakuma, @felicepantaleo, @jainshilpi, @abbiendi, @rappoccio, @kpedro88, @argiro, @HeinerTholen, @bsunanda, @imarches, @pfs, @thomreis, @tlampen, @alberto-sanchez, @ahinzmann, @lgray, @threus, @mmusich, @seemasharmafnal, @venturia, @pakhotin, @mmarionncern, @kreczko, @sethzenz, @calderona, @makortel, @smoortga, @acaudron, @ferencek, @jhgoh, @varuns23, @valuev, @jdolen, @HuguesBrun, @agrohsje, @fwyzard, @dildick, @battibass, @trocino, @forthommel, @rociovilar, @vandreev11, @Sam-Harper, @DryRun, @GiacomoSguazzoni, @tocheng, @VinInn, @jdamgov, @bellan, @nhanvtran, @gkasieczka, @rovere, @deguio, @schoef, @mschrode, @echapon, @ebrondol, @ptcox, @dgulhan, @clelange, @mkirsano, @cseez, @batinkov, @swertz, @alja, @jan-kaspar, @wddgit, @edjtscott, @JyothsnaKomaragiri, @mverzett, @dkotlins, @bachtis, @Martin-Grunewald, @cbernet, @gpetruc, @matt-komm, @mariadalfonso, @pvmulder, @folguera this is something you requested to watch as well.
@davidlange6, @slava77, @fabiocos you are the release manager for this.

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[perrotta]

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