NoMongo: adding a CreateMockContext Factory function for unit testing

[Piyushk8]

Is your feature request related to a problem? Please describe.
Current unit tests have multiple individually defined mock GraphQL contexts, which leads to inconsistencies, duplicated code, and increased maintenance overhead.

Describe the solution you'd like
Develop a centralized createMockContext factory function to generate consistent mock contexts. This factory will streamline test setups and provide a unified method to override defaults when needed.

Describe alternatives you've considered

• Utilizing a shared single mock object, which can be shared across all unit test files and make changes in it as per requirements

Approach to be followed (optional)

1. Create a new file mockContextFactory.ts containing the createMockContext function.
2. Implement an override mechanism that accepts custom parameters to modify the default context.
3. Refactor existing tests to use the new factory for consistency and improved maintainability.
4. Add dedicated unit tests for the factory function to ensure its correctness and flexibility.

Additional context
Implementing this factory will enhance test reliability, reduce duplication, and improve overall code readability by centralizing mock context creation.

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[Piyushk8]

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