Add backend tests for the users controller

[AnnaHsu1]

Description

Added tests for the user controller.

• Added connection test suite

• Added tests for the user timeline posts and jobs applied

• Refactored tests

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Name	Status	Preview	Updated (UTC)
soen-390-team05-w23-front-end	✅ Ready (Inspect)	Visit Preview	Apr 2, 2023 3:08am