CAMEL-19225: camel-jpa - Refactor JpaComponent

[zhfeng]

Description

Follow up #10954

Refactor JpaComponent and make it easier to remove DefaultTransactionStrategy in graal static analysis. It could be helpful for camel-quarkus PR

• Revisit #4048 to Springless JPA extension camel-quarkus#5147

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[zhfeng]

/component-test camel-jpa

Result ✅ The tests passed successfully

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