metrics: count telemetry server errors

[cce]

Summary

Following on #4932 this counts the number of telemetry reporting errors observed by the telemetry hook.

Test Plan

Existing tests should pass.

[codecov]

Codecov Report

Merging #4933 (ae8610c) into master (1313a7b) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #4933      +/-   ##
==========================================
- Coverage   53.51%   53.50%   -0.02%     
==========================================
  Files         432      432              
  Lines       53623    53624       +1     
==========================================
- Hits        28698    28693       -5     
- Misses      22699    22701       +2     
- Partials     2226     2230       +4     

Impacted Files	Coverage Δ
logging/telemetryhook.go	50.70% <0.00%> (-0.36%)	⬇️
ledger/roundlru.go	90.56% <0.00%> (-5.67%)	⬇️
network/wsPeer.go	67.06% <0.00%> (-2.39%)	⬇️
crypto/merkletrie/trie.go	66.42% <0.00%> (-2.19%)	⬇️
crypto/merkletrie/node.go	91.62% <0.00%> (-1.87%)	⬇️
catchup/peerSelector.go	98.95% <0.00%> (-1.05%)	⬇️
data/transactions/verify/txn.go	73.72% <0.00%> (-0.85%)	⬇️
catchup/service.go	69.08% <0.00%> (-0.25%)	⬇️
network/wsNetwork.go	64.92% <0.00%> (+0.17%)	⬆️
ledger/acctupdates.go	69.24% <0.00%> (+0.36%)	⬆️
... and 3 more

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