Fix created_at_height retrieval using git rev-list

[volta2030]

This pull request updates the transaction creation script to set the created_at_height field dynamically based on the current Git commit count, instead of using a hardcoded value. This ensures that the output UTXO JSON files more accurately reflect the current repository state.

Transaction metadata improvements:

• .github/scripts/create_transaction.py: Replaces the hardcoded created_at_height value with the current Git commit count for both the main output UTXO and the change UTXO, making the transaction metadata more representative of the repository's state at creation time. [1] [2]

[github-actions]

Code Review Required

@volta2030 @P1750A

This PR contains non-transaction changes and requires validator approval before merging.

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[Copilot]

Pull request overview

Updates the GitCoin transaction builder script to populate created_at_height dynamically from the repository’s Git history, improving the accuracy of UTXO metadata generated for transaction PRs.

Changes:

• Computes a current_height value via git rev-list --count HEAD.
• Sets created_at_height on both the recipient UTXO and optional change UTXO to that computed height.

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[volta2030]

/approve