See gh-20109

This commit makes sure to create a HazelcastClient if an instance name
is provided in configuration and if no such client already exists. This
harmonizes the behaviour with of the server counter-part.

See gh-20109

See gh-20107

See gh-20105

See gh-20104

See gh-19588

Closes gh-20100

Closes gh-20099

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Closes gh-20063