Properly setting HI flags

When acquiring flags, rec.doHeavyIon was not properly translated to flags.Reco.EnableHI. This caused problem in legacy HI reconstruction as it uses wrapper for component-accumulator setup for egamma. This MR fixes that and HImode or HIPmode functions are called when appropriate, so rec.doHeavyIon and flags.Reco.EnableHI are in sync.

The flag flags.Reco.EnableHI is automatically set True if flags.Input.ProjectName has _hi in it. It worked for data (ART test has data15_hi) so the problem was not present, but not for MC (ART test has mc16_5TeV or mc21_13p6TeV).

Tagging @stapiaar

Closes ATLASRECTS-7657