SPARK-3716 [GraphX] Update Analytics.scala for partitionStrategy assignment

Previously, when the val partitionStrategy was created it called a function in the Analytics object which was a copy of the PartitionStrategy.fromString() method. This function has been removed, and the assignment of partitionStrategy now uses the PartitionStrategy.fromString method instead. In this way, it better matches the declarations of edge/vertex StorageLevel variables.

Author: NamelessAnalyst <NamelessAnalyst@users.noreply.github.com>

Closes #2569 from NamelessAnalyst/branch-1.1 and squashes the following commits:

c24ff51 [NamelessAnalyst] Update Analytics.scala

(cherry picked from commit 5a21e3e7e97f135c81c664098a723434b910f09d)
Signed-off-by: Ankur Dave <ankurdave@gmail.com>