feat: limit pending tx query

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 62.66%. Comparing base (f373f6b) to head (09e12d8). Report is 326 commits behind head on develop.

Files	Patch %	Lines
app/workers/pool_transaction_check_worker.rb	50.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #2027 +/- ## =========================================== - Coverage 67.56% 62.66% -4.90% =========================================== Files 289 348 +59 Lines 7944 9720 +1776 =========================================== + Hits 5367 6091 +724 - Misses 2577 3629 +1052 ```

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