chore(ci): Upload SDK coverage report only from the main repository

[alainncls]

What does this PR do?

If the PR is made from the main Verax repository, the SDK coverage report is uploaded to Codecov.
If the PR is made from a forked repository, the SDK coverage is not uploaded to Codecov.

Related ticket

Fixes #767

Type of change

• Chore
• Bug fix
• New feature
• Documentation update

Check list

• Unit tests for any smart contract change
• Contracts and functions are documented

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.64%. Comparing base (f340f7c) to head (4cf754c).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #768   +/-   ##
=======================================
  Coverage   46.64%   46.64%           
=======================================
  Files          18       18           
  Lines         388      388           
  Branches       57       57           
=======================================
  Hits          181      181           
  Misses        205      205           
  Partials        2        2           

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