GH-5787 Fix SHACL shutdown interrupt race

[hmottestad]

GitHub issue resolved: #5787

Briefly describe the changes proposed in this PR:

Fixes a SHACL shutdown race where an interrupt between hasNext() and next() during statement transfer could surface as NoSuchElementException instead of RDF4J's interrupted Sail path.

This PR updates ConnectionHelper.transferStatements(...) to translate interrupted iteration failures into InterruptedSailException while preserving non-interrupt NoSuchElementException behavior, and adds focused regression coverage for both paths.

Fixes #5787

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PR Author Checklist (see the contributor guidelines for more details):

• my pull request is self-contained
• I've added tests for the changes I made
• I've applied code formatting (you can use mvn process-resources to format from the command line)
• I've squashed my commits where necessary
• every commit message starts with the issue number (GH-xxxx) followed by a meaningful description of the change

Validation:

• python3 .codex/skills/mvnf/scripts/mvnf.py --module core/sail/shacl --retain-logs --tail 500 ConnectionHelperTest
• mvn -o -Dmaven.repo.local=.m2_repo -pl core/sail/shacl '-PslowTestsOnly,!skipSlowTests' -DskipITs=false '-Dit.test=ShutdownDuringValidationIT#shutdownDuringValidationTransactional' verify
• cd scripts && ./checkCopyrightPresent.sh
• mvn -o -Dmaven.repo.local=.m2_repo -q -T 2C process-resources
• mvn -T 1C -o -Dmaven.repo.local=.m2_repo -Pquick clean install