Add unit tests for OverviewViewModel

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  Description

  This PR adds unit tests for the OverviewViewModel in the CashBud project. The existing OverviewViewModelTest.swift file did not have any unit tests, so this PR adds new test cases to ensure the functionality of the OverviewViewModel is properly tested.

Summary of Changes

• Created a new file TransactionsManagerMock.swift in the CashBudTests/Tests/Manager/ directory. This file contains a mock implementation of the TransactionsManager class.
• Modified the OverviewViewModelTest.swift file in the CashBudTests/Tests/ViewModels/ directory to import the TransactionsManagerMock file and use it to test the OverviewViewModel.
• Replaced the existing test cases in OverviewViewModelTest.swift with new test cases that use the TransactionsManagerMock to test the OverviewViewModel.

Please review and merge this PR to ensure proper test coverage for the OverviewViewModel.

Fixes #77.

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SonarCloud Quality Gate failed.   

0 Bugs
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0.0% Coverage
0.0% Duplication

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