Overhaul Dark Photon lines: merge dielectron lines

This MR merges the LowMassDielectron line slices, only cosindering now one both for prompt and displaced topologies. The other change is allow two NN cuts and, in turn, a heavily post-scaled line to normalize between the two cuts in the two topologies.

The BW does not change significantly, cuts were tailored for that.

Goes with lhcb-datapkg/ParamFiles!128 (merged)

PID overhaul (should probably be merged before): !1908 (merged)

For the bandwidth division

• @acasaisv please complete the table below, including lines added and removed.

Line name	Tuning parameters	Simulation sample
Hlt1LineRemoved	N/A	N/A
Hlt1DiElectronLowMass_SS_massSlice1_displaced	N/A	N/A
Hlt1DiElectronLowMass_SS_massSlice1_prompt	N/A	N/A
Hlt1DiElectronLowMass_SS_massSlice2_displaced	N/A	N/A
Hlt1DiElectronLowMass_SS_massSlice2_prompt	N/A	N/A
Hlt1DiElectronLowMass_SS_massSlice3_displaced	N/A	N/A
Hlt1DiElectronLowMass_SS_massSlice3_prompt	N/A	N/A
Hlt1DiElectronLowMass_SS_massSlice4_displaced	N/A	N/A
Hlt1DiElectronLowMass_SS_massSlice4_prompt	N/A	N/A
Hlt1DiElectronLowMass_massSlice1_displaced	N/A	N/A
Hlt1DiElectronLowMass_massSlice1_prompt	N/A	N/A
Hlt1DiElectronLowMass_massSlice2_displaced	N/A	N/A
Hlt1DiElectronLowMass_massSlice2_prompt	N/A	N/A
Hlt1DiElectronLowMass_massSlice3_displaced	N/A	N/A
Hlt1DiElectronLowMass_massSlice3_prompt	N/A	N/A
Hlt1DiElectronLowMass_massSlice4_displaced	N/A	N/A
Hlt1DiElectronLowMass_massSlice4_prompt	N/A	N/A
Hlt1DiElectronLowMass_Displaced	ElectronNN	/eos/lhcb/user/a/acasaisv/mdf-bwdivision/dp20-*
Hlt1DiElectronLowMass_NoIP	ElectronNN	/eos/lhcb/user/a/acasaisv/mdf-bwdivision/dp20-*
Hlt1DiElectronLowMass_NoIPNorm	ElectronNN (same value as Displaced line)	N/A
Hlt1DiElectronLowMass_SS_Displaced	ElectronNN (same value as Displaced line)	N/A
Hlt1DiElectronLowMass_SS_NoIP	ElectronNN (same value as NoIP line)	N/A
Hlt1DiElectronLowMass_SS_NoIPNorm	ElectronNN (same value as Displaced line)	N/A

(please feel free to delegate, or suggest a reassignment)

• @ahennequ for cuda changes
• @aiwieder for the BW division
• @ahabdelm for the QEE WG
• @mvesteri for RTA WP3 overall approval