remove slot swap ump tests for now, as subxt is a pain to maintain and it will take a long time until we can use them again. #639

Job	Run time
cargo-toml-fmt	5s
license-check	4m 36s
Rust check cargo build --release	4m 48s
Cancel Previous Runs	4s
Rust check cargo build --release --features dot	4m 47s
Rust check cargo build --release --features ksm	4m 47s
Rust check cargo test --all --features runtime-benchmarks	4m 47s
Rust check cargo test --all --features dot	4m 46s
Rust check cargo test --all --features ksm	4m 47s
Rust check cargo fmt --all -- --check	4m 36s
Rust check cargo clippy -- -D warnings	4m 48s
	42m 51s

Provide feedback