Remove unnecessary Agent class patches from googleadk extension tests (#169)

* Initial plan

* Remove unnecessary Agent patches from googleadk tests

Co-authored-by: JesuTerraz <96103167+JesuTerraz@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: JesuTerraz <96103167+JesuTerraz@users.noreply.github.com>

Author: Copilot

tests/tooling/extensions/googleadk/test_mcp_tool_registration_service.py

@@ -116,9 +116,6 @@ async def test_add_tool_servers_exchanges_token_when_not_provided(
             patch(
                 "microsoft_agents_a365.tooling.extensions.googleadk.services.mcp_tool_registration_service.get_mcp_platform_authentication_scope"
             ) as mock_get_scope,
-            patch(
-                "microsoft_agents_a365.tooling.extensions.googleadk.services.mcp_tool_registration_service.Agent"
-            ) as mock_agent_class,
         ):
             # Setup mocks
             mock_get_scope.return_value = ["https://test.scope/.default"]
@@ -129,8 +126,6 @@ async def test_add_tool_servers_exchanges_token_when_not_provided(
             mock_config_service.list_tool_servers = AsyncMock(return_value=[])
             mock_config_service_class.return_value = mock_config_service
 
-            mock_agent_class.return_value = mock_agent
-
             from microsoft_agents_a365.tooling.extensions.googleadk import (
                 McpToolRegistrationService,
             )
@@ -161,9 +156,6 @@ async def test_add_tool_servers_uses_provided_token(
             patch(
                 "microsoft_agents_a365.tooling.extensions.googleadk.services.mcp_tool_registration_service.Utility"
             ) as mock_utility,
-            patch(
-                "microsoft_agents_a365.tooling.extensions.googleadk.services.mcp_tool_registration_service.Agent"
-            ) as mock_agent_class,
         ):
             # Setup mocks
             mock_utility.resolve_agent_identity.return_value = "agent-123"
@@ -173,8 +165,6 @@ async def test_add_tool_servers_uses_provided_token(
             mock_config_service.list_tool_servers = AsyncMock(return_value=[])
             mock_config_service_class.return_value = mock_config_service
 
-            mock_agent_class.return_value = mock_agent
-
             from microsoft_agents_a365.tooling.extensions.googleadk import (
                 McpToolRegistrationService,
             )