CAMEL-20025: camel-aws - Add enum for region option

[oscerd]

Description

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Apache Camel coding standards and style

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[github-actions]

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[oscerd]

/component-test aws

Result ❌ The tests failed please check the logs

[github-actions]

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[oscerd]

/component-test aws

Result ❌ The tests failed please check the logs

[github-actions]

🤖 The Apache Camel test robot will run the tests for you 👍

[oscerd]

/component-test aws

Result ✅ The tests passed successfully

[github-actions]

🤖 The Apache Camel test robot will run the tests for you 👍