remove unneeded impls #1520

Job	Run time
Typecheck and Lint Demos (github-demo)	26s
Typecheck and Lint Demos (pet-demo)	28s
Build website	45s
Typecheck and Lint Demos (vite-demo)	24s
Run cargo fmt and clippy	12s
Run cargo test (excluding relay tests)	43s
Build js packages	39s
Run prettier	26s
Build json schema / Run build_json_schema	18s
Build compiler (x86_64-unknown-linux-musl) / Build compiler	1m 49s
Build fixtures / Run generate_isograph_fixtures	16s
Build compiler (aarch64-apple-darwin, macos-latest, isograph_cli, isograph_cli-macos-arm64) / Build compiler	1m 16s
Build compiler (aarch64-unknown-linux-musl, ubuntu-latest, isograph_cli, isograph_cli-bin-linux-a... / Build compiler	3m 2s
Build compiler (x86_64-apple-darwin, macos-latest, isograph_cli, isograph_cli-macos-x64) / Build compiler	1m 52s
Build compiler (x86_64-pc-windows-msvc, windows-latest, true, isograph_cli.exe, isograph_cli-bin-... / Build compiler	4m 20s
Build demos (github-demo)	5s
Build demos (pet-demo)	4s
Build demos (vite-demo)	7s
All checks passed	3s
Deploy website	22s
Release packages to NPM	1m 8s
Release packages to NPM (latest)	0s
	18m 45s

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