feat: encapsulate ENABLE_TX_POOL flag in TransactionPoolService

[natanasow]

Description

Currently, the ENABLE_TX_POOL flag is used in AccountService, which is not ideal, since the TransactionPoolService should take care of its own flag

Related issue(s)

Fixes #4503

Testing Guide

Changes from original design (optional)

N/A

Additional work needed (optional)

N/A

Checklist

• I've assigned an assignee to this PR and related issue(s) (if applicable)
• I've assigned a label to this PR and related issue(s) (if applicable)
• I've assigned a milestone to this PR and related issue(s) (if applicable)
• I've updated documentation (code comments, README, etc. if applicable)
• I've done sufficient testing (unit, integration, etc.)

[github-actions]

Test Results

 20 files  ±0  269 suites  ±0   21m 30s ⏱️ -35s
778 tests ±0  774 ✅ +1  4 💤 ±0  0 ❌  - 1 
794 runs  ±0  790 ✅ +1  4 💤 ±0  0 ❌  - 1 

Results for commit 0414f7f. ± Comparison against base commit 4ea1929.

♻️ This comment has been updated with latest results.

[quiet-node]

Couple of items

[konstantinabl]

Left a question

[quiet-node]

LGTM! That was my vision! Simple, effective, and not repetitive! Great work!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@            Coverage Diff             @@
##             main    #4581      +/-   ##
==========================================
+ Coverage   95.37%   95.42%   +0.04%     
==========================================
  Files         128      128              
  Lines       20647    20658      +11     
  Branches     1759     1762       +3     
==========================================
+ Hits        19692    19712      +20     
+ Misses        936      927       -9     
  Partials       19       19              

Flag	Coverage Δ
config-service	98.81% <ø> (ø)
relay	90.86% <100.00%> (+<0.01%)	⬆️
server	88.85% <ø> (ø)
ws-server	98.04% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
packages/relay/src/lib/precheck.ts	98.68% <100.00%> (-0.01%)	⬇️
...rvices/ethService/accountService/AccountService.ts	96.53% <100.00%> (ø)
...thService/transactionService/TransactionService.ts	98.85% <100.00%> (+1.12%)	⬆️
...s/transactionPoolService/transactionPoolService.ts	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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