Enable the reuse of cached informers on creation by SharedInformerFactory.

[Sud0x67]

This PR introduces a new constructor parameter, reuseExistingCachedInformer, to the SharedInformerFactory.

The aim is to facilitate the reuse of existing cached informers when creating informers through SharedInformerFactory.

Currently, SharedInformerFactory caches only the first informer created for each API type. Developers who wish to avoid creating a new informer each time must first call SharedInformerFactory#getExistingSharedIndexInformer before proceeding with creation.

By setting reuseExistingCachedInformer to true, SharedInformerFactory will automatically reuse existing cached informers instead of creating new ones. This approach simplifies the process and clearly indicates whether to utilize the cached factory, thereby reducing potential confusion.

The discussion can be found here Issue

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