chore(test): make DDB Scan/Query IT assertions order-independent

[Croway]

Summary

• DynamoDB Scan does not guarantee item ordering, but AWS2QueryRuleIT and AWS2ScanRuleIT were asserting specific values at items.get(0), relying on LocalStack's internal storage order
• Replaced positional assertions with order-independent checks: value sets via Collectors.toSet() and structural iteration over all items
• Also removed dead code (unused keyConditions and coll variables) from the affected test methods

Test plan

• All 27 camel-aws2-ddb integration tests pass with LocalStack
• All 27 camel-aws2-ddb integration tests pass with Floci (an alternative AWS emulator that returns Scan items in a different order)

[github-actions]

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[github-actions]

🧪 CI tested the following changed modules:

• components/camel-aws/camel-aws2-ddb

All tested modules (8 modules)

• Camel :: AWS2 DDB
• Camel :: JBang :: MCP
• Camel :: JBang :: Plugin :: Route Parser
• Camel :: JBang :: Plugin :: TUI
• Camel :: JBang :: Plugin :: Validate
• Camel :: Launcher :: Container
• Camel :: YAML DSL :: Validator
• Camel :: YAML DSL :: Validator Maven Plugin

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