Fix duplicate key due to non-lowercase collections in MongoDB

[ebyhr]

Description

The connector threw "Duplicate key {schema}.{table} (attempted merging values TABLE and TABLE)" error when tables exist with different cases like test and TEST.

io.trino.testing.QueryFailedException: Error listing tables for catalog mongodb: Duplicate key test_db_fymzuxlc22.test_collection_a2p6hs64ml (attempted merging values TABLE and TABLE)

	at io.trino.testing.AbstractTestingTrinoClient.execute(AbstractTestingTrinoClient.java:138)
	at io.trino.testing.DistributedQueryRunner.executeInternal(DistributedQueryRunner.java:565)
	at io.trino.testing.DistributedQueryRunner.execute(DistributedQueryRunner.java:548)
	at io.trino.sql.query.QueryAssertions$QueryAssert.lambda$new$1(QueryAssertions.java:317)
	at com.google.common.base.Suppliers$NonSerializableMemoizingSupplier.get(Suppliers.java:200)
	at io.trino.sql.query.QueryAssertions$QueryAssert.result(QueryAssertions.java:436)
	at io.trino.sql.query.QueryAssertions$QueryAssert.matches(QueryAssertions.java:357)
	at io.trino.plugin.mongodb.TestMongoConnectorTest.testNonLowercaseCollection(TestMongoConnectorTest.java:170)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at java.base/java.util.concurrent.ForkJoinTask.doExec$$$capture(ForkJoinTask.java:507)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1458)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:2034)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:189)
	Suppressed: java.lang.Exception: SQL: SELECT * FROM information_schema.tables WHERE table_catalog = 'mongodb' AND table_schema = 'test_db_fymzuxlc22'
		at io.trino.testing.DistributedQueryRunner.executeInternal(DistributedQueryRunner.java:572)
		... 12 more

Release notes

## MongoDB
* Fix failure when tables exist with different cases. ({issue}`issuenumber`)