ATLAS-5179, ATLAS-5180: Add unit tests for API layer, utils, and Redux

[pawarprasad123]

What changes were proposed in this pull request?

This PR adds automated tests for data-access and shared state/helpers. It validates HTTP wrappers, URL constants, pure utilities, and Redux slices without mounting full pages.

What changes do

• src/api/apiMethods/__tests__/**: Exercises API methods (success/error paths, headers, fetchApi usage) so refactors do not break server integration contracts.
• src/api/apiUrlLinks/__tests__/**: Locks URL shapes (paths, query params) so env-specific or versioned endpoints stay correct.
• src/utils/__tests__/**: Tests formatting, parsing, navigation helpers, and error-message helpers used across views.
• src/redux/**/__tests__/**: Tests reducers/selectors/async thunks where covered—guards global state behavior used by containers.

Why these files are used

• Failures here usually mean broken API calls, wrong links, or subtle state bugs that would surface as flaky UI; fixing at this layer is cheaper than debugging full screens.

How was this patch tested?

Manual test