Exclude core-contracts from SonarQube checks

[vcastellm]

Description

We don't want to check core-contracts repo from Edge

Changes include

• Bugfix (non-breaking change that solves an issue)
• Hotfix (change that solves an urgent issue, and requires immediate attention)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)

Checklist

• I have assigned this PR to myself
• I have added at least 1 reviewer
• I have added the relevant labels
• I have updated the official documentation
• I have added sufficient documentation in code

Testing

• I have tested this code with the official test suite
• I have tested this code manually

[codecov]

Codecov Report

Merging #1154 (8aa4370) into develop (6a1db1a) will decrease coverage by 0.05%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1154      +/-   ##
===========================================
- Coverage    54.27%   54.22%   -0.05%     
===========================================
  Files          132      132              
  Lines        17596    17596              
===========================================
- Hits          9550     9542       -8     
- Misses        7414     7420       +6     
- Partials       632      634       +2     

Impacted Files	Coverage Δ
blockchain/subscription.go	76.25% <0.00%> (-6.25%)	⬇️
syncer/client.go	61.79% <0.00%> (-1.42%)	⬇️

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[Stefan-Ethernal]

✅