[pgnccl][simple] clean up unused members of PGNCCL

[shuqiangzhang]

Stack from ghstack (oldest at bottom):

• -> [pgnccl][simple] clean up unused members of PGNCCL #139436

Summary:
Found those unused members when prototying something else.
Better remove unused members
Test Plan:
CI

Tags:

cc @H-Huang @awgu @kwen2501 @wanchaol @fegin @fduwjj @wz337 @wconstab @d4l3k @c-p-i-o

[pytorch-bot]

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As of commit 7fb730e with merge base 73fde0d ():
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[cyyever]

@Skylion007 Do you know why deleting code would increase instruction counts?

[shuqiangzhang]

@pytorchbot merge -f 'no CI failure after retry'

[pytorchmergebot]

Merge started

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