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This CL ensures that all tests in theSigninIntegrationTest pass
when the Unified Consent Feature is enabled. In achieves this in
the following steps.

1. It splits the SigninInteractionControllerTestCase class in 3:
a) SigninInteractionControllerTestCase: test cases that pass both when
Unified consent is enabled or disabled;
b) SigninInteractionControllerUnityDisabledTestCase: test cases that require
Unified Consent to be disabled;
c) SigninInteractionControllerUnityEnabledTestCase: test cases that require
Unified Consent to be enabled;

2. It updates all necessary tests in the SigninInteractionControllerTestCase
to pass when the Unified Consent is enabled.

3. It includes SigninInteractionControllerTestCase both in
ios_chrome_ui_egtests (that run with Unified Consent enabled) and
in ios_chrome_unified_consent_ui_tests (that run with Unified Consent disabled).

Bug: 960260

Change-Id: I0be1945ff290bd2fcbba44d64f733658c623b369
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1599009
Commit-Queue: Mihai Sardarescu <msarda@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Jérôme Lebel <jlebel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659466}