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`@ConditionalOnProperty` target property with no metadata

See original GitHub issue

Several auto-configurations use a condition on a property that has no metadata. As a result, trying to use it to customize the auto-configuration lead to a warning in an IDE.

The report detected the following:

org.springframework.cloud.task.batch.configuration.TaskBatchAutoConfiguration [spring.cloud.task.batch.listener.enable|spring.cloud.task.batch.listener.enabled]
org.springframework.cloud.task.batch.configuration.TaskJobLauncherAutoConfiguration [spring.cloud.task.batch.failOnJobFailure]
org.springframework.cloud.task.batch.listener.BatchEventAutoConfiguration [spring.cloud.task.batch.events.enabled]
org.springframework.cloud.task.batch.listener.BatchEventAutoConfiguration.JobExecutionListenerConfiguration#chunkEventsListener [spring.cloud.task.batch.events.chunk.enabled]
org.springframework.cloud.task.batch.listener.BatchEventAutoConfiguration.JobExecutionListenerConfiguration#itemProcessEventsListener [spring.cloud.task.batch.events.item-process.enabled]
org.springframework.cloud.task.batch.listener.BatchEventAutoConfiguration.JobExecutionListenerConfiguration#itemReadEventsListener [spring.cloud.task.batch.events.item-read.enabled]
org.springframework.cloud.task.batch.listener.BatchEventAutoConfiguration.JobExecutionListenerConfiguration#itemWriteEventsListener [spring.cloud.task.batch.events.item-write.enabled]
org.springframework.cloud.task.batch.listener.BatchEventAutoConfiguration.JobExecutionListenerConfiguration#jobExecutionEventsListener [spring.cloud.task.batch.events.job-execution.enabled]
org.springframework.cloud.task.batch.listener.BatchEventAutoConfiguration.JobExecutionListenerConfiguration#skipEventsListener [spring.cloud.task.batch.events.skip.enabled]
org.springframework.cloud.task.batch.listener.BatchEventAutoConfiguration.JobExecutionListenerConfiguration#stepExecutionEventsListener [spring.cloud.task.batch.events.step-execution.enabled]
org.springframework.cloud.task.configuration.SingleTaskConfiguration [spring.cloud.task.singleInstanceEnabled]
org.springframework.cloud.task.listener.TaskEventAutoConfiguration [spring.cloud.task.events.enabled]

Also, please note that properties in @ConditionalOnPropety have to be defined with the canonical format (so spring.cloud.task.singleInstanceEnabled must be spring.cloud.task.single-instance-enabled for instance).