This change fixes a situation where error handling was skipped during `processCommit()` in case the `doCommit()` failed. The error handling was set up via an `onErrorResume` operator that was nested inside a `then(...)`, applied to an inner `Mono.empty()`. As a consequence, it would never receive an error signal (effectively decoupling the onErrorResume from the main chain). This change simply moves the error handling back one level up. It also simplifies the `doCommit` code a bit by getting rid of the steps that artificially introduce a `Mono<Object>` return type, which is not really needed. A pre-existing test was missing the fact that the rollback didn't occur, which is now fixed. Another dedicated test is introduced building upon the `ReactiveTestTransactionManager` class. Closes gh-30096
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