NoMongo: migrate the file test/routes/graphql/Mutation/deleteChatMessage.test.ts to integration test

[Piyushk8]

Describe the bug

The deleteChatMessage GraphQL mutation (in test/routes/graphql/Mutation/deleteChatMessage.test.ts) uses mocked tests, contradicting the project's requirement for integration testing via real API calls for all mutations in that directory.

Expected Behavior

All GraphQL mutations, including deleteChatMessage, should be thoroughly integration tested using actual API calls. Mutation files should reside in test/routes/Graphql/Mutation/*.

Actual Behavior

deleteChatMessage uses mocked tests, bypassing the real API and services.

Impact

Mocked tests provide a false sense of security, risking undetected bugs and regressions. Inconsistent testing hinders maintainability.

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