IsolationBuilder:Make re-entrant

IsolationBuilder:

• Make re-entrant (includes making a couple of methods const),
• run and fix a couple of clang-tidy checks ,
• use consistent indentation

This merge request affects 1 package:

• Reconstruction/RecoAlgs/IsolationAlgs

This merge request affects 2 files:

• Reconstruction/RecoAlgs/IsolationAlgs/src/IsolationBuilder.cxx
• Reconstruction/RecoAlgs/IsolationAlgs/src/IsolationBuilder.h

Adding @goetz as watcher

added Reconstruction master review-pending-level-1 labels

CI Result SUCCESS (hash dca8d3f1)

	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 24597]

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

merged

mentioned in commit 201e1b36

added sweep:ignore label