Fix Nightly Clippy Warnings (backport #18065) (#18070)

* chore: cargo +nightly clippy --fix -Z unstable-options

(cherry picked from commit 6514096a67)

# Conflicts:
#	core/src/banking_stage.rs
#	core/src/cost_model.rs
#	core/src/cost_tracker.rs
#	core/src/execute_cost_table.rs
#	core/src/replay_stage.rs
#	core/src/tvu.rs
#	ledger-tool/src/main.rs
#	programs/bpf_loader/build.rs
#	rbpf-cli/src/main.rs
#	sdk/cargo-build-bpf/src/main.rs
#	sdk/cargo-test-bpf/src/main.rs
#	sdk/src/secp256k1_instruction.rs

* chore: cargo fmt

(cherry picked from commit 789f33e8db)

* Updates BPF program assert_instruction_count tests.

(cherry picked from commit c1e03f3410)

# Conflicts:
#	programs/bpf/tests/programs.rs

* Resolve conflicts

Co-authored-by: Alexander Meißner <AlexanderMeissner@gmx.net>
Co-authored-by: Michael Vines <mvines@gmail.com>

sdk/src/derivation_path.rs

@@ -46,7 +46,7 @@ impl TryFrom<&str> for DerivationPath {
 
 impl AsRef<[ChildIndex]> for DerivationPath {
     fn as_ref(&self) -> &[ChildIndex] {
-        &self.0.as_ref()
+        self.0.as_ref()
     }
 }
 
@@ -88,7 +88,7 @@ impl DerivationPath {
     }
 
     fn _from_absolute_path_insecure_str(path: &str) -> Result<Self, DerivationPathError> {
-        Ok(Self(DerivationPathInner::from_str(&path).map_err(
+        Ok(Self(DerivationPathInner::from_str(path).map_err(
             |err| DerivationPathError::InvalidDerivationPath(err.to_string()),
         )?))
     }