feat(migrate)!: ignore `SKIP`-only cases #672

Job	Run time
Format TOML with Taplo	3s
Check (ubuntu-latest, beta)	37s
Check (windows-latest, stable)	1m 24s
Check (macOS-latest, beta)	39s
cargo-deny	21s
Check (ubuntu-latest, stable)	38s
Format Rust with `cargo fmt` (stable)	13s
Check (macOS-latest, stable)	46s
Check (windows-latest, beta)	1m 39s
block-autosquash-commits	-1s
Documentation (beta)	33s
Documentation (stable)	33s
Clippy (stable)	35s
Clippy (beta)	36s
Test Suite (ubuntu-latest, beta)	58s
Test Suite (windows-latest, stable)	3m 43s
Test Suite (windows-latest, beta)	2m 20s
Test Suite (ubuntu-latest, stable)	1m 3s
Test Suite (macOS-latest, stable)	53s
Test Suite (macOS-latest, beta)	53s
	18m 26s

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