get shard id early on bootstrap

[sstanculeanu]

Reasoning behind the pull request

Proposed changes

Testing procedure

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

❌ Patch coverage is 61.53846% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.61%. Comparing base (adf0114) to head (b0c3d12).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
epochStart/bootstrap/process.go	61.53%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7860      +/-   ##
==========================================
- Coverage   76.62%   76.61%   -0.02%     
==========================================
  Files         814      814              
  Lines      110955   110960       +5     
==========================================
- Hits        85019    85011       -8     
- Misses      20142    20153      +11     
- Partials     5794     5796       +2     

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[github-actions]

❌ Integration Tests completed with failures or errors.

📊 MultiversX Automated Test Report: View Report

🔄 Build Details:

• mx-chain-go Commit Hash: b0c3d12990833fe4f9852f6a42a45fcf443dfd9b
• Current Branch: bootstrap-fix
• mx-chain-go Target Branch: master
• mx-chain-simulator-go Target Branch: main
• mx-chain-testing-suite Target Branch: main
• mx-chain-simulator-go Commit Hash: 771e2f48f7a5d3cc83fc880558e5efe7befd7ee8

🚀 Environment Variables:

• TIMESTAMP: 2026_MAY_28__10_39_51
• PYTEST_EXIT_CODE: 1