refactor(test): Refactore tests for maintenance, users, and vehicles endpoints

• Updated the test for adding maintenance to check for additional error messages related to missing JSON body.
• Modified user registration test to retrieve user ID from the "me" endpoint instead of the registration response.
• Reintroduced the unauthenticated user test for getting current user and vehicles, ensuring session cookies are cleared before the requests.
• Enhanced vehicle creation test to accommodate additional error messages for missing fields.

assigned to @doiteau

added 1 commit

• aed1d82a - fix(docker): Update images to use mirrored versions for consistency

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