Add E2E triage test case for not-affected resolution (RHEL-174694)

[TomasTomecek]

Summary

• Add triage E2E test case for RHEL-174694 (CVE-2026-37459 frr) which expects a not-affected resolution — the first test case for this resolution type
• Restructure test assertions so package and fix_version are only checked for resolution types that have them (BACKPORT, REBASE), since NotAffectedData has a different schema
• For NOT_AFFECTED, assert the agent produces a non-empty explanation

Corresponding test fixture data (mock Jira + mock repo config) added to the testing-jiras repo.

Test plan

• Ran make run-triage-agent-e2e-tests locally — RHEL-174694 test case passes

🤖 Generated with Claude Code

[gemini-code-assist]

Code Review

This pull request updates the end-to-end triage agent tests to support the NOT_AFFECTED resolution. It introduces a new test case using NotAffectedData and restructures the assertions in test_triage_agent to be resolution-specific. Feedback suggests strengthening the assertions for the NOT_AFFECTED resolution by verifying the data type is NotAffectedData and ensuring justification_category is present.

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[gemini-code-assist]

To ensure robust validation of the NOT_AFFECTED resolution, we should explicitly verify that real_output.data is an instance of NotAffectedData (preventing Pydantic union coercion issues) and assert that justification_category is populated and non-empty, as it is a required metadata field for Red Hat's triage process.

Suggested change

	elif expected_output.resolution == Resolution.NOT_AFFECTED:
	# TODO: validate justification_category against a known set of values
	assert real_output.data.explanation
	elif expected_output.resolution == Resolution.NOT_AFFECTED:
	assert isinstance(real_output.data, NotAffectedData)
	assert real_output.data.explanation
	assert real_output.data.justification_category