Hud10837/toolkit tests in sdk

[hud10837]

Related to issue: https://devtopia.esri.com/runtime/kotlin/issues/6421

Description:

Adds support for including tests that are located in the kotlin SDK repo into the toolkit. This allows us to use internal dependencies such as mockingjay in the toolkit tests. This PR adds just an example of how to do it in the template test, as well as an implementation for featureforms to add mockingjay as a dependency.

Note: tests in the sdk repo are included additively, so internal tests do not preclude public tests. The internal tests are visible while working in the toolkit repo using the Android view in the project hierarchy. Additionally, dependencies and all other gradle considerations should still be done on the toolkit side.

Summary of changes:

• Update the project build.gradle to include a new property which records the location of toolkit tests in the sdk repo which sits side-by-side with the toolkit
• Update the template build.gradle and featureforms build.gradle to make use of this functionality

Pre-merge Checklist

• a vTest Job for this PR has been run
  • link: https://runtime-kotlin.esri.com/view/all/job/vtest/job/toolkit/929/
  • https://runtime-kotlin.esri.com/view/all/job/vtest/job/toolkit/936/
• Unit and/or integration tests have been added to exercise this PR's logic, and the tests are passing:
  • Yes
  • No

[kaushikrw]

@hud10837 This works quite well! I tested it with a dummy test and was easy to setup. I just have some minor cosmetic feedback below

[kaushikrw]

👍