B2taunu with btracking lines

HLT2 lines for B2tau(23pinu)nu with B-tracking. Added to semileptonic lines, with persistreco=True (going into FULL stream).

Needs Rec!2868 (merged), LHCb!4208 (merged), Detector!462 (merged), lhcb-datapkg/PRConfig!339 (merged)

needs gaudi/Gaudi!1489 (merged) and lhcb-datapkg/PRConfig!339 (merged) to be merged (and for v37?)

FYI: @sklaver, @mmulder

Standard rate test (upgrade_minbias_hlt1_filtered; inclusive is all semileptonic lines):

Line:    Hlt2SLB_BToDPiPi_DToKPiPi_BTrackingDecision                     Incl: 0.0 +/- 0.0 kHz, Excl: 0.0 +/- 0.0 kHz
Line:    Hlt2SLB_BToTauNu_TauToPiPiPiNu_BTrackingDecision                Incl: 0.77087 +/- 0.2912 kHz,  Excl: 0.44049 +/- 0.2202 kHz

NOTE: for Sprucing still to be decided, add in later MR? Following !2360 (merged) at least. Persistreco has similar consideration, in principle there for isolation. The HF track objects do need to be persisted (again). VP raw banks preferably too.

See for more info also slides

Hlt/Hlt2Conf/CMakeLists.txt

@@ -62,6 +62,7 @@ if(BUILD_TESTING AND USE_DD4HEP)
             Hlt2Conf.test_hlt2_all_lines
             Hlt2Conf.test_hlt2_bandwidth_production_streams
             Hlt2Conf.test_hlt2_bandwidth_wg_streams
+            Hlt2Conf.test_hlt2_btracking_reco_plus_lines
             Hlt2Conf.test_hlt2_flavourtagging_flavourtaggers
             Hlt2Conf.test_persistreco_check_flavourtags
             Hlt2Conf.test_hlt2_flavourtagging_sskaontagger