SpringBoot Enable Redis connection pool if commons-pool2 is on the classpath

See #26183 for some more background. jedis turns on the pool by default but lettuce is not.

Comment From: snicoll

@weixsun there is no need to rebase your PR against main as we will do it as part of reviewing the PR. We prefer to rebase and squash all your commits into one anyway. Please note that every commit you push sends a notification to all watchers of this repository.

Comment From: snicoll

Duplicate of #26326