Development: Add missing hashCode() methods to all classes overriding equals()

[MaximilianAnzinger]

Checklist

General

• I chose a title conforming to the naming conventions for pull requests.

Server

• Important: I implemented the changes with a very good performance and prevented too many (unnecessary) database calls.
• I strictly followed the server coding and design guidelines.

Motivation and Context

Teamscale reports numerous places where classes override the equals method but not a proper hashCode method.
Resolves 49 TS issues 👍

Description

Adds hashCode implementation for all classes that override equals.

Testserver States

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Review Progress

Code Review

• Code Review 1
• Code Review 2

Summary by CodeRabbit

• Refactor
  • Enhanced hashing behavior across various classes to improve data handling and consistency.

[coderabbitai]

Walkthrough

These updates introduce enhancements to the hashing behavior across various classes in the Artemis project. By implementing or modifying hashCode() methods, each change aims to ensure that objects of different types or with distinct attributes are hashed uniquely. This is crucial for the efficient storage and retrieval of objects in collections like HashSet or HashMap, improving the overall performance and reliability of the system.

Changes

File(s)	Change Summary
.../domain/TempIdObject.java	New hashCode() method added to calculate hash based on the superclass hash and tempIDTransient.
.../compass/umlmodel/activity/UMLActivityElement.java, .../classdiagram/UMLAttribute.java, .../classdiagram/UMLMethod.java	Added hashCode() methods to calculate hash based on specific attributes in each class, enhancing the hashing behavior for improved object uniqueness.

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