Add Lepton-Lepton HNL T Track Lines (and Refactor N -> Pi Mu Line to Match)

This merge request aims to add four lines to the set of QEE HLT2 lines which trigger on displaced T track lepton-lepton vertices. All these lines persist the rawbanks, allowing more flexibility for offline analyses. Long tracks which pass ISMUON are persisted as extra outputs to facilitate use for muon-coupled HNLs without the requirement of analysis production. Alongside these new lines, the T track N -> pi mu is refactored to match.

These lines make an exclusive T track selection for:

• N -> mu mu nu_mu
• N -> mu e nu_e

For each mode, there exists both a signal and same-sign (i.e. mu+ mu+) line. The same-sign lines are for the control and identification of combinatorial background. The same-sign lines have a 10% prescale.

These lines are modeled off the existing merge request to add a N -> mu pi line (Moore!4129), but with appropriate PID and looser IP, IP Chi2 and P (paid for by the PID). They cover the additional HNL decay modes, as shown below:

The bandwidth is projected to be ~ 14 MB/s for all of the new lines, based on 100,000 events run using the QEE testing framework. These bandwidth increases are more than offset by the LL and DD HNL retuning in Moore!4481. The N -> pi mu refactor has no effect on this line's bandwidth.

Breakdown by line

Line	Rate (KHz)	Bandwidth (GB/s)
Hlt2QEE_N_EMuNu_inclTTDecision	0.0903	0.00588199
Hlt2QEE_N_MuMuNu_inclTTDecision	0.1161	0.0075383
Hlt2QEE_N_EMuNu_SS_inclTTDecision	not measurable	not measurable
Hlt2QEE_N_MuMuNu_SS_inclTTDecision	not measurable	not measurable

Dependent on Moore!4129 (changes to qee_builders), and Rec!4233 and Moore!4262 (T track electrons and electron PID)