Remove deprecated --badger.truncate CLI flag

[yurishkuro]

No description provided.

[codecov]

Codecov Report

Merging #3410 (956b5b4) into master (57d4131) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3410      +/-   ##
==========================================
+ Coverage   96.49%   96.51%   +0.02%     
==========================================
  Files         261      261              
  Lines       15275    15267       -8     
==========================================
- Hits        14739    14735       -4     
+ Misses        452      450       -2     
+ Partials       84       82       -2     

Impacted Files	Coverage Δ
plugin/storage/badger/options.go	100.00% <ø> (ø)
pkg/config/tlscfg/cert_watcher.go	92.63% <0.00%> (-2.11%)	⬇️
cmd/query/app/server.go	95.58% <0.00%> (+1.47%)	⬆️
cmd/query/app/static_handler.go	97.60% <0.00%> (+1.79%)	⬆️

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