fix(nano): fix nc creation API

[glevco]

Motivation

There's a bug in the NC creation API where sometimes it displays less items than the requested count, even though more items are available. This was reported by @pedroferreira1.

The problem was that there was a filter after pagination logic, where items for contracts created by other contracts would be filtered out after the collection of count items.

Acceptance Criteria

• Fix filter after pagination logic.
• Remove unused method.
• Add test covering the issue.

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[github-actions]

Bencher Report

Branch	fix/nc-creation-api
Testbed	ubuntu-22.04

Click to view all benchmark results

Benchmark	Latency	Benchmark Result minutes (m) (Result Δ%)	Lower Boundary minutes (m) (Limit %)	Upper Boundary minutes (m) (Limit %)
sync-v2 (up to 20000 blocks)	📈 view plot 🚷 view threshold	1.75 m (+1.21%) Baseline: 1.73 m	1.56 m (88.92%)	2.08 m (84.35%)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.13%. Comparing base (c8434eb) to head (8714656).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1487      +/-   ##
==========================================
+ Coverage   86.12%   86.13%   +0.01%     
==========================================
  Files         437      437              
  Lines       33757    33755       -2     
  Branches     5274     5275       +1     
==========================================
+ Hits        29073    29076       +3     
+ Misses       3662     3657       -5     
  Partials     1022     1022              

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