[FEATURE REQ] Migrate Junit4 to Jnuit5 in azure-spring-data-cosmos

[Netyyyy]

Is your feature request related to a problem? Please describe.
Prepare for upgrading to Spring Boot 4, migrate all tests in azure-spring-data-cosmos from Junit4 to Jnuit5

Describe the solution you'd like
Migrate all tests in azure-spring-data-cosmos from Junit4 to Jnuit5, make sure all tests pass as before.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
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Information Checklist
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[github-actions]

@moarychan @Netyyyy @rujche @saragluna

[github-actions]

Thank you for your feedback. Tagging and routing to the team member best able to assist.