quarkus: Hibernate Reactive Panache guide missing documentation on `@TestReactiveTransaction`

Describe the bug

The Quarkus Hibernate Reactive Panache guide does not have any information on the existence of the @TestReactiveTransaction annotation nor how to use it.

Maybe it doesn’t belong in that guide because it isn’t specific to Panache Reactive and its more generic to reactive transaction management. That being said, it still isn’t discussed anywhere in the guides. I think, too, more is needed than a sentence or two just saying that its there. I think there need to be some examples that show how to use it.

Furthermore, the Tests and transactions section of the getting started testing guide is pretty weak. I think both need to be expanded on somewhere.

Maybe there needs to be a guide or something that talks about transaction management in general?

Expected behavior

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Actual behavior

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How to Reproduce?

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Output of uname -a or ver

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Output of java -version

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GraalVM version (if different from Java)

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Quarkus version or git rev

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Build tool (ie. output of mvnw --version or gradlew --version)

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Additional information

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