ns for fx: remove deprecated code

[vkuzo]

Stack from ghstack:

• ns for fx: enable shadowing int8 to int8 #56205 ns for fx: enable shadowing int8 to int8
• ns for fx: move unmatchable mod/fun/meth mapping to mappings file #56197 ns for fx: move unmatchable mod/fun/meth mapping to mappings file
• ns for fx: make call_method nodes work in NS APIs #56196 ns for fx: make call_method nodes work in NS APIs
• ns for fx: remove deprecated code #56195 ns for fx: remove deprecated code
• ns for fx: enable call_method nodes in graph matching #56194 ns for fx: enable call_method nodes in graph matching
• ns for fx: fill out coverage for node I/O types #55918 ns for fx: fill out coverage for node I/O types
• ns for fx: add category for ops which accept fp32 or int8 input #55859 ns for fx: add category for ops which accept fp32 or int8 input
• ns for fx: move op dtype category mapping to separate file #55858 ns for fx: move op dtype category mapping to separate file

Summary:

This is outdated, removing (forgot to clean up in a previous PR).

Test Plan:

python test/test_quantization.py TestFXGraphMatcher

Reviewers:

Subscribers:

Tasks:

Tags:

Differential Revision: D27805334

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💊 CI failures summary and remediations

As of commit f6419ce (more details on the Dr. CI page):

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• 1/1 failures possibly* introduced in this PR
  • 1/1 non-scanned failure(s)

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This pull request has been merged in 07f3eaa.