Fixed the node redundancy mechanism

[iulianpascalau]

• fixed the node redundancy mechanism by providing a new private key

Testing scenario:

1. Start a new testnet, choose a validator node (we call this node A). Store its validatorKey.pem.
2. Stop another node (doesn't matter the node - we will call it B). Provide it with the stored public key file (node's A key).
3. Change the B's prefs.toml file, set the RedundancyLevel value to 1.
4. Start the B node. Grep the log by the broadcasting message heartbeat message message. Should not use the public key from the provided file (should not broadcast A's public key), but a random BLS key (you can find this random key by grepping on generated BLS private key for redundancy handler).
5. Stop node A for ~30 rounds. Grep node B's log for broadcasting message heartbeat message, should find A's public key for a couple of times.
6. Start node A. Node B should no longer broadcast the public key of the A node.

[sasurobert]

Go lint

[codecov]

Codecov Report

Merging #3465 (2e63b50) into master (203003b) will decrease coverage by 0.00%.
The diff coverage is 62.50%.

❗ Current head 2e63b50 differs from pull request most recent head 277a377. Consider uploading reports for the commit 277a377 to get more accurate results

@@            Coverage Diff             @@
##           master    #3465      +/-   ##
==========================================
- Coverage   73.85%   73.85%   -0.01%     
==========================================
  Files         579      579              
  Lines       73400    73407       +7     
==========================================
+ Hits        54209    54213       +4     
- Misses      14824    14825       +1     
- Partials     4367     4369       +2     

Impacted Files	Coverage Δ
factory/processComponents.go	62.97% <62.50%> (-0.05%)	⬇️

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[gabi-vuls]

System test passed.