CollectionBase: Update for thread-safety checker const changes.

The thread-safety checker is getting more strict on const checks. Fix resulting warnings.

This merge request affects 1 package:

• Database/APR/CollectionBase

This merge request affects 1 file:

• Database/APR/CollectionBase/CollectionBase/ICollectionMetadata.h

Adding @mnowak ,@ssnyder as watchers

added Database JetEtmiss master review-pending-level-1 labels

CI Result SUCCESS (hash a1c1ae8f)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis	DetCommon
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
DetCommon: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 45445]

Approving.

Jason (L1)

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit c5c402af

added sweep:ignore label