Remove the Map based job repository/explorer and their DAOs

This commit removes the deprecated Map-based job repository
and job explorer implementations with their respective DAOs.
Using the `EnableBatchProcessing` annotation now requires a
datasource bean to be defined in the application context.
This will be reviewed as part of #3942.

This commit is a first pass that updates related tests to use
the JDBC-based job repository/explorer with an embedded database.
A second pass should be done to improve tests by caching/reusing
embedded databases if possible.

Issue #3836

spring-batch-samples/src/main/resources/simple-job-launcher-context.xml

@@ -20,10 +20,6 @@
 		p:isolationLevelForCreate = "${batch.isolationlevel}"
 		p:dataSource-ref="dataSource" p:transactionManager-ref="transactionManager" p:lobHandler-ref="lobHandler"/>
 
-	<bean id="mapJobRepository"
-		class="org.springframework.batch.core.repository.support.MapJobRepositoryFactoryBean"
-		lazy-init="true" autowire-candidate="false" />
-
 	<bean id="jobOperator"
 		class="org.springframework.batch.core.launch.support.SimpleJobOperator"
 		p:jobLauncher-ref="jobLauncher" p:jobExplorer-ref="jobExplorer"