Removed unnecessary heartbeat components

[iulianpascalau]

Reasoning behind the pull request

• low intra-shard peer counters were observed in the logs by grepping after network connection status

Proposed changes

• removed unnecessary heartbeat components that created confusion regarding the shard membership of a peer

Testing procedure

• standard system test and observe the connected peer counters

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]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b5be263) 80.18% compared to head (420251b) 80.21%.

Additional details and impacted files

@@                Coverage Diff                @@
##           rc/v1.6.next1    #5942      +/-   ##
=================================================
+ Coverage          80.18%   80.21%   +0.02%     
=================================================
  Files                709      708       -1     
  Lines              94191    94124      -67     
=================================================
- Hits               75526    75498      -28     
+ Misses             13316    13280      -36     
+ Partials            5349     5346       -3     

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[gabi-vuls]

Normal allin test: v1.6.15-dev-config-eb2e06c06d -> fix-low-intra-shard-peers--6dd4a1b386

--- Specific errors ---

block hash does not match 1561
wrong nonce in block 699
miniblocks does not match 0
num miniblocks does not match 0
miniblock hash does not match 0
block bodies does not match 0
receipts hash missmatch 0

/------/

--- Statistics ---

Nr. of all ERRORS: 7
Nr. of all WARNS: 1174
Nr. of new ERRORS: 6
Nr. of new WARNS: 0
Nr. of PANICS: 0

/------/

--- ERRORS ---

/------/