Moving non-deterministic info line to debug output

[kholoimov]

This PR moves the branch-address log from info to debug.

That output includes a raw pointer address, which is not deterministic across runs because it depends on runtime memory layout. Because of that, the logs are not deterministic even when the simulation result is the same. This makes automatic testing by direct log comparison difficult unless the output is cleaned up first.
It also exposes low-level technical detail that is mainly useful for debugging, not for normal simulation logs.

We want to make this change to keep FairShip output cleaner and more deterministic for testing.

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Checklist:

• Followed the Contributing Guidelines

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 8d558291-d8fe-4419-8c36-f6da1c6c1c7a

📥 Commits

Reviewing files that changed from the base of the PR and between 4e38dd3 and b4581cf.

📒 Files selected for processing (2)

• CONTRIBUTORS
• fairroot/base/sink/FairRootFileSink.cxx

✅ Files skipped from review due to trivial changes (1)

• CONTRIBUTORS

🚧 Files skipped from review as they are similar to previous changes (1)

• fairroot/base/sink/FairRootFileSink.cxx

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📝 Walkthrough

Walkthrough

A single logging statement in FairRootFileSink::CreatePersistentBranchesAny is downgraded from info-level to debug-level verbosity during persistent ROOT branch creation. The CONTRIBUTORS file is updated with an additional contributor name.

Changes

Logging and Contributor Updates

Layer / File(s)	Summary
Persistent branch creation log level fairroot/base/sink/FairRootFileSink.cxx	Per-branch log statement for persistent ROOT branch creation downgraded from LOG(info) to LOG(debug).
Contributor list update CONTRIBUTORS	New contributor name added to the CONTRIBUTORS file.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: moving a non-deterministic log message from info to debug level.
Description check	✅ Passed	The description is directly related to the changeset, explaining the rationale for moving the branch-address log from info to debug level.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[karabowi]

Can you please:

1. add a separate commit to this PR with your name in the CONTRIBUTORS file?
2. change the target branch from FairRootGroup:master to FairRootGroup:dev?

[kholoimov]

@karabowi done!