Fixes #3463 remove usage of assert and replace with appropriate assertThat's

[Atheer2104]

Description (required)

Fixes #3463

What changes did you make and why?

The changes that were made was to replace the junit assert in the test suite to use hamcrest assertThat instead. Now Most of the test case were applicable have been changed from assert to use assertThat. Note there are still some test cases left that still rely on assert.

Tests performed (required)

Testing was performed, the entire test suite was run and all the of tests that succeeded before the rewrite succeed now also

Tested {build variant, e.g. ProdDebug} on {name of device or emulator} with API level {API level}.

This was tested on on :app:testBetaDebugUnitTest, the API level was 34

Screenshots (for UI changes only)

Need help? See https://support.google.com/android/answer/9075928

---

Note: Please ensure that you have read CONTRIBUTING.md if this is your first pull request.

[whym]

If I understand #3463 correctly, the task asks to replace Kotlin's assert, not Junit's assertions like Assert.assertNotNull.

Are there advantages of Hamcrest assertions over Junit assertions? Do they provide better messages?