app: refactor prioritise to beta feature

[corverroos]

Move priority protocol to beta feature as it still has a goroutine leak and needs a big refactor.

category: misc
ticket: #1421

[codecov]

Codecov Report

Base: 53.33% // Head: 53.21% // Decreases project coverage by -0.12% ⚠️

Coverage data is based on head (21aa715) compared to base (514ae1d).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1432      +/-   ##
==========================================
- Coverage   53.33%   53.21%   -0.13%     
==========================================
  Files         148      148              
  Lines       18390    18393       +3     
==========================================
- Hits         9809     9788      -21     
- Misses       7234     7255      +21     
- Partials     1347     1350       +3     

Impacted Files	Coverage Δ
app/featureset/featureset.go	100.00% <ø> (ø)
app/app.go	60.47% <100.00%> (-1.17%)	⬇️
core/priority/prioritiser.go	61.62% <0.00%> (-2.72%)	⬇️
app/vmock.go	72.53% <0.00%> (-1.56%)	⬇️
core/scheduler/scheduler.go	72.66% <0.00%> (-1.20%)	⬇️
core/qbft/qbft.go	81.93% <0.00%> (-0.43%)	⬇️

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