deps: remove polkadot-sdk umbrella crate (#1926)

* deps: get rid of polkadot-sdk umbrella crate

* fix nits

* Update subxt/src/backend/mod.rs

* Update subxt/src/events/events_client.rs

* Update metadata/src/utils/validation.rs

* cargo clippy fix

* fix ui tests

signer/src/crypto/derive_junction.rs

@@ -3,7 +3,6 @@
 // see LICENSE for license details.
 
 use codec::{Decode, Encode};
-use polkadot_sdk::sp_crypto_hashing;
 
 // This code is taken from sp_core::crypto::DeriveJunction. The logic should be identical,
 // though the API is tweaked a touch.

signer/src/ecdsa.rs

@@ -8,7 +8,6 @@ use codec::Encode;
 use crate::crypto::{seed_from_entropy, DeriveJunction, SecretUri};
 use core::str::FromStr;
 use hex::FromHex;
-use polkadot_sdk::sp_crypto_hashing;
 use secp256k1::{ecdsa::RecoverableSignature, Message, Secp256k1, SecretKey};
 use secrecy::ExposeSecret;
 
@@ -362,7 +361,7 @@ mod test {
 
     use super::*;
 
-    use polkadot_sdk::sp_core::{self, crypto::Pair as _, ecdsa::Pair as SpPair};
+    use sp_core::{self, crypto::Pair as _, ecdsa::Pair as SpPair};
 
     #[test]
     fn check_from_phrase_matches() {

signer/src/sr25519.rs

@@ -354,8 +354,7 @@ mod test {
 
     use super::*;
 
-    use polkadot_sdk::sp_core::{self, crypto::Pair as _, sr25519::Pair as SpPair};
-    use polkadot_sdk::sp_keyring;
+    use sp_core::{self, crypto::Pair as _, sr25519::Pair as SpPair};
 
     #[test]
     fn check_from_phrase_matches() {