test(langchain): Deduplicate by removing node.callspec.id matching

[alexander-alderman-webb]

Description

Jointly parametrize on instructions and the expected value of the gen_ai.system_instructions attribute.

Issues

Reminders

• Please add tests to validate your changes, and lint your code using tox -e linters.
• Add GH Issue ID & Linear ID (if applicable)
• PR title should use conventional commit style (feat:, fix:, ref:, meta:)
• For external contributors: CONTRIBUTING.md, Sentry SDK development docs, Discord community

[github-actions]

Codecov Results 📊

✅ 2205 passed | ⏭️ 154 skipped | Total: 2359 | Pass Rate: 93.47% | Execution Time: 8m 4s

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 13311 uncovered lines.

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Generated by Codecov Action

[cursor]

Cursor Bugbot has reviewed your changes and found 2 potential issues.

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