StoreGate: add SG::HiveMgrSvc::setNumProcs helper

The setter methods of Gaudi::ConcurrencyFlags are only accessible to a hard-coded list of friend classes. Make SGHiveMgrSvc.h public and add a setNumProcs static helper method so we can control the list of friend classes ourselves.

Relates to ATR-28997.

Requesting explicit review/approval from @ssnyder and/or @leggett.

This merge request affects 1 package:

• Control/StoreGate

This merge request affects 6 files:

• Control/StoreGate/StoreGate/SGHiveMgrSvc.h
• Control/StoreGate/src/SGHiveMgrSvc.cxx
• Control/StoreGate/src/SGHiveMgrSvc.h
• Control/StoreGate/src/components/StoreGateSvc_entries.cxx
• Control/StoreGate/test/SGHive_test.cxx
• Control/StoreGate/test/SGTiming_test.cxx

Adding @ssnyder as watcher

added 24.0 Core review-pending-level-1 labels

removed review-pending-level-1 label

added review-pending-expert label

CI Result SUCCESS (hash 7abcf430)

	Athena	AthSimulation
externals
cmake
make
tests

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Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 6588] (remote access info)

changed the description

resolved all threads

removed review-pending-expert label

added review-pending-level-1 label

resolved all threads

MR looks good to me thus approving - L1 shifter

removed review-pending-level-1 label

added review-approved label

added review-approved-tier0 label

merged

mentioned in commit 946f4587

mentioned in merge request !70026 (merged)