*: migrate to tracker v2

[dB2510]

Migrate to tracker v2 and remove tracker v1 and its references. Also removes tracker_v2 featureflag.

category: refactor
ticket: #1478

[codecov]

Codecov Report

Patch coverage: 83.07% and project coverage change: -0.08 ⚠️

Comparison is base (03ed1d8) 55.33% compared to head (2a8ead1) 55.25%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1853      +/-   ##
==========================================
- Coverage   55.33%   55.25%   -0.08%     
==========================================
  Files         170      169       -1     
  Lines       22258    21819     -439     
==========================================
- Hits        12316    12057     -259     
+ Misses       8371     8203     -168     
+ Partials     1571     1559      -12     

Impacted Files	Coverage Δ
app/featureset/featureset.go	100.00% <ø> (ø)
app/app.go	62.71% <37.50%> (+1.17%)	⬆️
core/tracker/tracker.go	76.62% <85.02%> (+5.51%)	⬆️
app/vmock.go	72.82% <0.00%> (-3.08%)	⬇️
core/leadercast/transport.go	76.33% <0.00%> (+1.18%)	⬆️
core/priority/prioritiser.go	61.79% <0.00%> (+1.41%)	⬆️
core/qbft/qbft.go	82.98% <0.00%> (+9.24%)	⬆️

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