[WIP] Remove the legacy podio I/O components and services

[tmadlener]

BEGINRELEASENOTES

• Remove the legacy podio I/O components and services (PodioDataSvc, k4DataSvc, FCCDataSvc, PodioInput, PodioOutput and MetaDataHandle). These have been marked as deprecated before.
• Switch all existing tests over to use IOSvc and EventDataSvc based I/O and TES instead
• Remove a few test cases which explicitly covered k4DataSvc functionality only and for which we have an equivalent test already for IOSvc

ENDRELEASENOTES

• Starts from Add more utility functions for setting collection level parameters #391 (but can probably be moved to main rather cleanly if necessary). I suspect merging this one will take a bit though
• There is one test case that is still failing where I haven't yet understood why (CreateExampleEventData_cellID).
• Check where things break downstream
  • k4MarlinWrapper: Remove support for legacy I/O components k4MarlinWrapper#475
  • k4Gen: Use the metadata utilities from k4FWCore instead of MetaDataHandle k4Gen#56
  • k4RecCalorimeter: Replace MetaDataHandle with MetadataUtils functionality HEP-FCC/k4RecCalorimeter#228
  • k4Reco: Switch to overload taking the algorithm as argument k4Reco#52
  • k4SimDelphes: Fix deprecation warnings related to PodioDataSvc k4SimDelphes#154
  • k4GaudiPandora: Switch to the new utility for retrieving cell id encoding k4GaudiPandora#28

[tmadlener]

I can build a local stack with these changes and all the linked PRs.

[jmcarcell]

I have pushed a few commits removing references and old files.

[jmcarcell]

Some tests could not be needed anymore because what they do now is also done in other tests. TwoProducers.py simple has two algorithms producing, but we have other tests doing that too.

[tmadlener]

For the tests I have removed a few but I have not done a really comprehensive survey of which ones are also covered somewhere else. Should we do this in this PR or do we do another one? I am happy to do either.

[jmcarcell]

I think it can be done here since there can't be that many; the candidates are the ones that are modified to use IOSvc. I had a look yesterday and only TwoProducers.py was clearly redundant. Maybe also https://github.com/key4hep/k4FWCore/blob/main/test/k4FWCoreTest/CMakeLists.txt#L133 but the other versions of CheckExampleEventData do other things.

[tmadlener]

I will have another look and update this PR accordingly.