[SPARK-3786] [PySpark] speedup tests

This patch try to speed up tests of PySpark, re-use the SparkContext in tests.py and mllib/tests.py to reduce the overhead of create SparkContext, remove some test cases, which did not make sense. It also improve the performance of some cases, such as MergerTests and SortTests.

before this patch:

real	21m27.320s
user	4m42.967s
sys	0m17.343s

after this patch:

real	9m47.541s
user	2m12.947s
sys	0m14.543s

It almost cut the time by half.

Author: Davies Liu <davies.liu@gmail.com>

Closes #2646 from davies/tests and squashes the following commits:

c54de60 [Davies Liu] revert change about memory limit
6a2a4b0 [Davies Liu] refactor of tests, speedup 100%