feat: update getTransactionCount to always require a blockNumOrTag parameter (#3840)

[mwb-al]

Description:

Update getTransactionCount signature to always require a blockNumOrTag parameter

Related issue(s):

Fixes #3840

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[lfdt-bot]

🎉 Snyk checks have passed. No issues have been found so far.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

@@           Coverage Diff           @@
##             main    #3861   +/-   ##
=======================================
  Coverage        ?   82.13%           
=======================================
  Files           ?       89           
  Lines           ?     5133           
  Branches        ?     1035           
=======================================
  Hits            ?     4216           
  Misses          ?      586           
  Partials        ?      331           

Flag	Coverage Δ
config-service	94.04% <ø> (?)
relay	81.29% <100.00%> (?)
server	80.81% <ø> (?)
ws-server	61.00% <ø> (?)

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Files with missing lines	Coverage Δ
packages/relay/src/lib/eth.ts	72.18% <ø> (ø)
...rvices/ethService/accountService/AccountService.ts	83.43% <100.00%> (ø)

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