Remove GetNumNodes trie functionality

[iulianpascalau]

Reasoning behind the pull request

The GetNumNodes functionality had some edge cases. This functionality was solely used in tests so it can be safely removed.

Proposed changes

• removed GetNumNodes trie unused functionality

Testing procedure

• standard system-test

Pre-requisites

Based on the Contributing Guidelines the PR author and the reviewers must check the following requirements are met:

• was the PR targeted to the correct branch?
• if this is a larger feature that probably needs more than one PR, is there a feat branch created?
• if this is a feat branch merging, do all satellite projects have a proper tag inside go.mod?

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (feat/polaris-fixes@c69e883). Click here to learn what that means.
Patch has no changes to coverable lines.

❗ Current head 5c3d6a2 differs from pull request most recent head 1f8be7b. Consider uploading reports for the commit 1f8be7b to get more accurate results

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Additional details and impacted files

@@                  Coverage Diff                  @@
##             feat/polaris-fixes    #5024   +/-   ##
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  Coverage                      ?   70.78%           
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  Files                         ?      649           
  Lines                         ?    85374           
  Branches                      ?        0           
=====================================================
  Hits                          ?    60436           
  Misses                        ?    20397           
  Partials                      ?     4541           

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[gabi-vuls]

System test passed .

@@ Log scanner @@

remove-numNodes-trie-functionality

================================================================================

• Known Warnings 6
• New Warnings 1
• Known Errors 0
• New Errors 0
• Panics 0
  ================================================================================
• block hash does not match 1865
• miniblocks does not match 0
• miniblock hash does not match 0
• receipts hash missmatch 0
• wrong nonce in block 782
  ================================================================================
• No jailed nodes on the thestnet
  ================================================================================