ci: add duplicate artifact guard to release-check

[IgnazioDS]

Summary

• delete all active * 2* duplicate artifacts from the repo workspace
• add scripts/release/check_no_duplicate_pairs.sh to detect duplicate pairs (<name> plus <name> 2) while pruning generated directories by default
• wire the duplicate guard into scripts/release/checklist.sh and expose make check-no-duplicates
• document the new guard in docs/RELEASE.md
• ignore *.tsbuildinfo build artifacts

Validation

• bash -n scripts/release/check_no_duplicate_pairs.sh
• synthetic duplicate pair test (guard must fail)
• ./scripts/release/check_no_duplicate_pairs.sh
• make check-no-duplicates
• ./scripts/release/check_version_consistency.sh

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