Remove IATP Mock from umbrella

[mgarciaLKS]

Description

Now that the DIM WALLET STUB has been implemented and is the recommended solution, the IATP mock is no longer necessary.

Additionally, the IATP mock increases the size of the umbrella application and consumes unnecessary resources, as it includes its own set of tests.

There have been instances where PRs trigger runtime errors, causing tests to fail. Removing the IATP mock will help streamline the codebase, reduce resource usage, and prevent these runtime issues.

Proposed Action

Remove the IATP mock implementation and its associated tests.

[kss682]

Eg: PR #198 fails due to IATP mock test.