Prepare for new GaudiPartProp in Gaudi v38

gaudi/Gaudi!1493 (merged) replaces the old GaudiPartProp with a backport of LHCb Kernel/PartProp. This deprecates headers like GaudiKernel/ParticleProperty.h (which is not really needed in LHCb) and introduces the namespace Gaudi::Decays that might clash with Decays in some cases.

This backward compatible MR is to make sure that when we switch to Gaudi v38 everything still works.

added backport run2 backport sim10 lhcb-gaudi-head labels

/ci-test --without-downstream --platforms x86_64_v2-centos7-gcc12-opt

added ci-test-triggered label

• [2024-01-23 10:44] Validation started with lhcb-master-mr#10213
• [2024-01-23 13:15] Validation started with lhcb-master-mr#10217
• [2024-01-23 14:25] Validation started with lhcb-gaudi-head#3798
• [2024-01-24 00:05] Validation started with lhcb-gaudi-head#3799
• [2024-01-24 09:59] Validation started with lhcb-master-mr#10231
• [2024-01-25 00:04] Validation started with lhcb-gaudi-head#3800
• [2024-01-25 00:40] Validation started with lhcb-gaudi-head#3800

added RTA label

mentioned in merge request Rec!3723 (merged)

added 1 commit

• a1991923 - Prevent clashes with Gaudi::Decays namespace

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changed title from Drop unused include to Prepare for new GaudiPartProp in Gaudi v38

changed the description

mentioned in merge request gaudi/Gaudi!1493 (merged)

marked this merge request as draft

added 1 commit

• b6f08026 - Prevent clashes with Gaudi::Decays namespace

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marked this merge request as ready

resolved all threads

added 9 commits

• b6f08026...b0579beb - 7 commits from branch master
• cef75341 - Drop unused include
• ed2faee3 - Prevent clashes with Gaudi::Decays namespace

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merged

mentioned in commit 65c88e32

mentioned in merge request !4440 (merged)

mentioned in issue Moore#699 (closed)

removed backport run2 label

mentioned in merge request !4854