test(generate): remove redundant pure-classification unit tests

Classification correctness (which family/kind/return-class a syscall maps
to) is verified by inspection against the man pages and the classifier
rules, not by dedicated unit tests. The tracing-relevant outcome — which
fd/path/byte-count the generated BPF C actually captures — is covered by
the GenerateTracepointsC codegen tests and the end-to-end integration
tests, all of which are retained.

Removed:
- internal/generate/family_test.go (ClassifySyscallFamily / .Family table)
- internal/generate/retclassify_test.go (ClassifyRet read/write/transfer/
  unclassified tables)
- ~70 pure-classification tests trimmed from classify_test.go, keeping only
  the GenerateTracepointsC codegen/tracing tests plus the shared helpers
  (mustParseAll, mqFormats, phaseAFormats, syntheticEnter/Exit, itoa) used
  by codegen_test.go.
- pure-classification funcs interleaved in codegen_test.go
  (TestClassifyRet*Unclassified, TestClassifyTkillFallsThroughToNull,
  Test{Mkdirat,Rmdir}FamilyAndKindMatchSiblings).

Kept all TestGenerate* handler tests (they assert the generated BPF C
captures the correct fd/path/arg-index/return classification), the
isNoreturnSyscall tests, docs-drift guards, eventloop dispatch tests, and
the integration suite — so every affected syscall still has tracing
coverage. No tracing gaps discovered.

generate package: go test (incl. -race) green; mage build green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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