metrics: fix TestGetValue

[algorandskiy]

Summary

TestGetValue registers a new metric that breaks other tests expectations on number of metrics. This might not be caught be CI because of sharding.

Test Plan

This is a test fix.

[codecov]

Codecov Report

Merging #4879 (805770b) into master (c0e044b) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4879      +/-   ##
==========================================
- Coverage   54.06%   54.05%   -0.01%     
==========================================
  Files         427      427              
  Lines       53474    53474              
==========================================
- Hits        28909    28905       -4     
- Misses      22299    22303       +4     
  Partials     2266     2266              

Impacted Files	Coverage Δ
network/wsPeer.go	68.97% <0.00%> (-2.87%)	⬇️
catchup/peerSelector.go	98.95% <0.00%> (-1.05%)	⬇️
ledger/testing/randomAccounts.go	56.00% <0.00%> (-0.62%)	⬇️
data/transactions/logic/assembler.go	86.50% <0.00%> (+0.13%)	⬆️
ledger/acctupdates.go	69.24% <0.00%> (+0.24%)	⬆️
catchup/service.go	70.04% <0.00%> (+0.24%)	⬆️
crypto/merkletrie/node.go	93.48% <0.00%> (+1.86%)	⬆️
crypto/merkletrie/trie.go	68.61% <0.00%> (+2.18%)	⬆️

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more