FINERACT-2540: Add unit tests for IpAddressUtils

[devi-pathak2263]

Description

Description

This PR adds unit tests for the IpAddressUtils utility class.

The tests verify the behavior of the getClientIp() method under different request context scenarios, including:

• When no request context is available
• When a request context exists but the IP attribute is missing
• When a valid IP attribute is present
• When the IP attribute is a non-string object and must be converted using toString()

These tests improve reliability and increase test coverage for request-related utilities used across the platform.

JIRA: https://issues.apache.org/jira/browse/FINERACT-2540

Testing

Executed locally:

• ./gradlew spotlessApply
• ./gradlew :fineract-core:test

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