Remove redundant test_standalone and tool_standalone crates

[Copilot]

test_standalone and tool_standalone are fully superseded by test_bindgen and the broader test suite. Removes them to reduce CI time.

Why they're redundant:

• Every bindgen output mode tested by test_standalone (--sys, --flat, --no-deps, --vtbl, --derive) is already covered by test_bindgen modules (bool_sys, struct_sys/win, interface_cpp_sys, derive_struct, struct_arch_a/w, etc.)
• All runtime Windows API calls (CoCreateGuid, SysAllocString, Uri::CreateUri, Calendar::new(), etc.) are covered by test_core, test_strings, and the winrt/ crates
• tool_standalone/src/main.rs already carried // TODO: move these into the new bindgen test/tool

Removed:

• crates/tests/misc/standalone/ — 33 pre-generated b_*.rs binding files + runtime tests (~4,100 lines)
• crates/tools/standalone/ — the regeneration tool that produced those files (~260 lines)
• Auto-regenerated test.yml and clippy.yml via cargo run -p tool_yml
• Removed standalone from the tool matrix in .github/workflows/gen.yml

CI savings: 4 steps removed per platform × 5 platforms = 20 fewer invocations per run (test + clippy, for both test_standalone and tool_standalone), plus the gen.yml matrix is reduced by one entry.

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[Kenny Kerr (kennykerr)]

Copilot you need to update the gen.yml workflow to remove the test.

[Copilot]

Copilot you need to update the gen.yml workflow to remove the test.

Done — removed standalone from the tool matrix in .github/workflows/gen.yml in ca87172.