Hello,

This MR is mostly importing !26767 from 21.2 to master, with the original MR description pasted below.

A protection is added against invalid TauTrack links when retrieving the tau tracks or the number of tau tracks.
This is required to support tau track thinning, used e.g. in DAOD_PHYS.
Now, only the tau tracks that have a valid link are considered in the TauJets interface class.
In particular, the behaviour of nAllTracks() had to be changed to be consistent with allTracks().size().
If one only keeps e.g. classifiedCharged tau tracks by thinning away the other tracks, nAllTracks() will now return the number of classifiedCharged tracks.

Something new compared to the R21 MR: to keep track of the total number of tracks associated with the tau in the reconstruction, a new Aux variable is introduced (mapped to xAOD::TauJetParameters::nAllTracks). So the user is now able to tell if tracks were thinned in the AOD->DAOD step, by comparing tau->nAllTracks() to tau->detail(xAOD::TauJetParameters::nAllTracks, nTracksTot).

Cheers,
Bertrand

ROOT-10940 is hitting the AthAnalysis projects in this test, unlike
all the other projects weirdly enough.

At the same time also disabled some of the tests completely, as they
do not work correctly with the reduced EDM provided by AthAnalysis.

All clients will need to set this flag of EventInfoCnvAlgCfg(...) correctly
from now on, otherwise they'll get an import error if they used an incorrect
setting in one of the lightweight offline releases.

Leaked AttributeListSpecification.

operator<< should be defined within the namespace of the object its
printing.  Otherwise, it won't work correctly with clang.

Don't try to dereference a null pointer, even in code that is not executed.

Hello,

This MR is dropping a range check on tau eta and phi that was introduced because we used to set dummy default values (-1111) for eta and phi for 0-prong and >5-prong taus, leading to eta = NAN upon retrieval.
This has been fixed in the reconstruction (ATLTAU-1665), where we no longer set dummy values.
So we can now drop the range check in the TauJet interface class, to save a tiny amount of CPU.
This MR does not change the reconstruction output.
It can wait until 22.0.23 is built.

Cheers,
Bertrand

* Derive TrigByteStreamCnvSvc from ByteStreamCnvSvcBase instead of ByteStreamCnvSvc.
* Implement explicit EventContext passing through all methods which need it. Make the interface implementation methods retrieve the EventContext and call the context-aware local methods.

Following the setup in 21.2, the package only builds one
tool for AthAnalysis. The one used by xAODTrackingAthenaPool
in this project (as well).

This largely meant switching all the conditional compilation
expressions to using XAOD_ANALYSIS.

Test the functionality of the ByteStreamMetadataTool. The tool should do
nothing wihtout complaint for empty input. The tool should transcribes a
ByteStreamMetadata object from input into a container in output. The
tool should transcribe a ByteStreamMetadataContainer from input to
output. Should there already be content in the output, matching content
should be ignored and new content should be appended.

xAODTriggerAthenaPool_20.1.7.2_test - passes
xAODTriggerAthenaPool_master-20190911_test - passes (reference file updated)

xAODMuonAthenaPool_20.1.7.2_test - passes
xAODMuonAthenaPool_20.7.2.2_test - passes
xAODMuonAthenaPool_20.7.9.9_test - passes
xAODMuonAthenaPool_21.0.79_test - passes (reference file updated)
xAODMuonAthenaPool_master-20190911_test - passes (reference file updated)

xAODTrigRingerAthenaPool_21.0.79_test - passes (reference file updated)

xAODTrigMuonAthenaPool_20.1.7.2_test - passes
xAODTrigMuonAthenaPool_21.0.79_test - passes (reference file updated)

xAODTrigMissingETAthenaPool_21.0.79_test - passes (reference file updated)

xAODTrigEgammaAthenaPool_21.0.79_test - passes (reference file updated)