[QEE] Collection of changes to QEE lines for June TS

This is the branch to collect QEE MRs for changes to be implemented for the TS in June.

Please refer to instructions here.

MR	Description	BW change
!4598 (merged)	QEE A2MuMu lines
!4924 (merged)	Update sexaquark lines for next TS
!4978 (merged)	Reduce QEE Single Electron Rates
!4984 (merged)	Move pT threshold of single electron line up to reduce rate
!5009 (merged)	Tighten qonia selections

The overall BW changes are shown below:

HLT2:

Spruce: