Harmonize equals/hashCode of OverrideMetadata to use class identity

This commit harmonizes the equals/hashCode behavior of OverrideMetadata
to always take the implementation class as a factor for its identity.

This is important as two OverrideMetadata implementations could use
the same strategy and other settings while creating the override value
in a totally different way. This commit makes sure they are identified
as different.

Closes gh-33005

Author: snicoll

spring-test/src/main/java/org/springframework/test/context/bean/override/OverrideMetadata.java

@@ -163,7 +163,7 @@ public boolean equals(Object other) {
 		if (other == this) {
 			return true;
 		}
-		if (other == null || !getClass().isAssignableFrom(other.getClass())) {
+		if (other == null || other.getClass() != getClass()) {
 			return false;
 		}
 		OverrideMetadata that = (OverrideMetadata) other;
@@ -182,7 +182,7 @@ public boolean equals(Object other) {
 
 	@Override
 	public int hashCode() {
-		int hash = Objects.hash(this.beanType.getType(), this.beanName, this.strategy);
+		int hash = Objects.hash(getClass().hashCode(), this.beanType.getType(), this.beanName, this.strategy);
 		return (this.beanName != null ? hash : hash +
 				Objects.hash(this.field.getName(), Arrays.hashCode(this.field.getAnnotations())));
 	}

spring-test/src/main/java/org/springframework/test/context/bean/override/mockito/MockitoSpyBeanOverrideMetadata.java

@@ -98,23 +98,6 @@ <T> T createSpy(String name, Object instance) {
 		return (T) mock(toSpy, settings);
 	}
 
-	@Override
-	public boolean equals(@Nullable Object other) {
-		if (other == this) {
-			return true;
-		}
-		// For SpyBean we want the class to be exactly the same.
-		if (other == null || other.getClass() != getClass()) {
-			return false;
-		}
-		return super.equals(other);
-	}
-
-	@Override
-	public int hashCode() {
-		return getClass().hashCode() * 29 + super.hashCode();
-	}
-
 	@Override
 	public String toString() {
 		return new ToStringCreator(this)