[grid] Extract Node session creation to use Either to help retry sessions accurately #9168
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Description
Extract new session creation method in the LocalNode to return Either.
Motivation and Context
New session requests should only be retried if Node does not have available slots for the request. In case the session could be not be created at the driver end, then session request should not be retried.
The changes start the refactoring required to solve #9154.
Types of changes
Checklist