Fixes #1472 - Create withAuth component to manage automatic redirect to login page

[bconti123]

Fixes #1472

What changes did you make and why did you make them?

• Created withAuth hook to manage automatic redirect to login page.
• Removed instances of old redirect method and refactored code in Events, UserAdmin, ProjectList, and ManageProjects components.
• Added auth to the props of ManageProjects and ProjectList components.
• Added an explanation of the withAuth hook as a comment in App.jsx.
• Why: To make the code cleaner and reduce the number of lines. In the future, withAuth component will be added to the new component.
• Wasn't able to fix the redirect method, so decided to leave it as is in the ProjectForm component and index.jsx due to the complexity of the code.