test: Add tests for all the TasksList methods and features

[gvgesanto2]

Description

Task: https://github.com/microverseinc/curriculum-javascript/blob/main/todo-list/tests_2.md

This PR makes the following changes:

• Adds tests for the TasksList.setTaskDescription() method (responsible for editing the task description)
• Adds tests for the TasksList.removeCompletedTasks() method (responsible for removing all completed tasks)
• Adds tests for the TasksList.toggleTaskIsCompleted() method (responsible for updating a task isCompleted status)
• Adds tests for the TasksList.updateTasksIndexes() method (responsible for updating the tasks indexes)
• Removes unused functions (from the id.utils.js file) and methods (from the Task.js file)

Plus, it adopts the following methodologies and conventions:

• For the CSS/Sass:
  • BEM methodology for naming the CSS classes
  • A modified version of the Scalable and Modular Architecture for CSS (SMACSS) methodology for organizing the CSS code into categorized folders/files (base, components, layout, and utilities)
  • Atomic Design methodology for breaking down the CSS components into atoms, molecules, and organisms
• For the JavaScript:
  • MVP architecture (a variation of the MVC pattern) to separate the application business logic from the presentation logic (DOM manipulation tasks)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Tests (changes related to testing)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project (no linters errors)
• I have checked my code and corrected any misspellings
• I have commented my code
• I have deleted any unused code as comments in my codebase

Screenshots

[ShoiraTa]

STATUS: APPROVED ✔️

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Hi @gvgesanto2 ,

Your project is complete! Great job for nailing it right on the first attempt 🥇. There is nothing else to say other than... it's time to merge it 🍾🚢 . Congratulations! 🎉💯🌟

Cheers and Happy coding! 👏 👏 👏

Feel free to leave any questions or comments in the PR thread by mentioning my Github username if something is not 100% clear.

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