go/runtime/txpool: Add txpool metric for rejected runtime transactions

[ptrus]

No description provided.

[codecov]

Codecov Report

Merging #4724 (dbd8852) into master (22ee108) will decrease coverage by 0.06%.
The diff coverage is 87.93%.

@@            Coverage Diff             @@
##           master    #4724      +/-   ##
==========================================
- Coverage   66.86%   66.80%   -0.07%     
==========================================
  Files         440      440              
  Lines       49224    49228       +4     
==========================================
- Hits        32916    32885      -31     
- Misses      12252    12287      +35     
  Partials     4056     4056              

Impacted Files	Coverage Δ
go/runtime/txpool/metrics.go	100.00% <ø> (ø)
go/runtime/registry/config.go	70.68% <33.33%> (-0.83%)	⬇️
go/worker/common/committee/keymanager.go	89.47% <89.47%> (ø)
go/worker/compute/executor/committee/node.go	71.08% <90.00%> (-0.33%)	⬇️
go/runtime/txpool/txpool.go	77.97% <100.00%> (+0.62%)	⬆️
go/worker/common/committee/node.go	61.04% <100.00%> (+1.66%)	⬆️
go/worker/common/committee/runtime_host.go	50.00% <100.00%> (ø)
go/runtime/host/sandbox/sandbox.go	59.85% <0.00%> (-6.70%)	⬇️
go/consensus/tendermint/apps/beacon/genesis.go	63.63% <0.00%> (-6.07%)	⬇️
...nsensus/tendermint/apps/keymanager/transactions.go	47.22% <0.00%> (-5.56%)	⬇️
... and 37 more

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