TrigT1CaloByteStream: Make RodHeaderByteStreamTool const.

Make interfaces of RodHeaderByteStreamTool const, for MT compatibility.

This merge request affects 2 files:

• Trigger/TrigT1/TrigT1CaloByteStream/src/RodHeaderByteStreamTool.cxx
• Trigger/TrigT1/TrigT1CaloByteStream/src/RodHeaderByteStreamTool.h

Adding @kwhalen ,@afaulkne as watchers

added Trigger master review-pending-level-1 labels

CI Result SUCCESS (hash d82aa888)

	Athena	AthSimulation	AthGeneration	AnalysisBase
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
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
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 23145]

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

merged

mentioned in commit f53444b2

added sweep:ignore label