feat(phase-32): add automated tests V3 for data sources, scoring, campaigns and snapshots (T-235 to T-237)

backend/tests/fixtures/sample_elastic_rule.toml

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+[metadata]
+creation_date = "2025/01/15"
+updated_date = "2025/06/01"
+maturity = "production"
+
+[rule]
+author = ["Test Author"]
+description = "Detects the creation of a scheduled task via schtasks.exe, which is commonly used by adversaries for persistence."
+name = "Scheduled Task Created via Schtasks"
+severity = "medium"
+type = "eql"
+language = "eql"
+query = '''
+process where process.name : "schtasks.exe" and
+  process.args : ("/create", "-create") and
+  process.args : ("/sc", "-sc") and
+  not process.parent.executable : ("C:\\Program Files\\*", "C:\\Program Files (x86)\\*")
+'''
+risk_score = 47
+rule_id = "test-elastic-001"
+tags = ["Persistence", "Windows"]
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1053"
+name = "Scheduled Task/Job"
+reference = "https://attack.mitre.org/techniques/T1053/"
+[[rule.threat.technique.subtechnique]]
+id = "T1053.005"
+name = "Scheduled Task"
+reference = "https://attack.mitre.org/techniques/T1053/005/"
+[rule.threat.tactic]
+id = "TA0003"
+name = "Persistence"
+reference = "https://attack.mitre.org/tactics/TA0003/"