Add missing mock call expectations

`CmdShowRouteDetailsTest` was complaing about some unexpected calls:
```
GMOCK WARNING:
Uninteresting mock function call - returning directly.
    Function call: getAllPortInfo(@0x7f8d0c000b10 {})
NOTE: You can safely ignore the above warning unless this call should 
not happen.  Do not suppress it by blindly adding an EXPECT_CALL() if 
you don't mean to enforce the call.  See 
https://github.com/google/googletest/blob/master/docs/gmock_cook_book.md#knowing-when-to-expect
for details.

GMOCK WARNING:
Uninteresting mock function call - returning directly.
    Function call: getAggregatePortTable(@0x7f8d04001120 {})
NOTE: You can safely ignore the above warning unless this call should not happen.  Do not suppress it by blindly adding an EXPECT_CALL() if you don't mean to enforce the call.  See https://github.com/google/googletest/blob/master/docs/gmock_cook_book.md#knowing-when-to-expect for details.

GMOCK WARNING:
Uninteresting mock function call - returning directly.
    Function call: getAllPortInfo(@0x7f8d2d100c20 {})
NOTE: You can safely ignore the above warning unless this call should not happen.  Do not suppress it by blindly adding an EXPECT_CALL() if you don't mean to enforce the call.  See https://github.com/google/googletest/blob/master/docs/gmock_cook_book.md#knowing-when-to-expect for details.
```

Author: benoit-nexthop

fboss/cli/fboss2/test/CmdShowRouteDetailsTest.cpp

@@ -193,6 +193,12 @@ TEST_F(CmdShowRouteDetailsTestFixture, queryClient) {
   setupMockedAgentServer();
   EXPECT_CALL(getMockAgent(), getRouteTableDetails(_))
       .WillOnce(Invoke([&](auto& entries) { entries = routeEntries; }));
+  // Mock the calls made by populateAggregatePortMap and populateVlanPortMap
+  EXPECT_CALL(getMockAgent(), getAllPortInfo(_))
+      .Times(2)
+      .WillRepeatedly(Invoke([&](auto& entries) { entries.clear(); }));
+  EXPECT_CALL(getMockAgent(), getAggregatePortTable(_))
+      .WillOnce(Invoke([&](auto& entries) { entries.clear(); }));
 
   auto cmd = CmdShowRouteDetails();
   CmdShowRouteDetailsTraits::ObjectArgType queriedEntries;
@@ -205,6 +211,12 @@ TEST_F(CmdShowRouteDetailsTestFixture, queryNetworkEntries) {
   setupMockedAgentServer();
   EXPECT_CALL(getMockAgent(), getRouteTableDetails(_))
       .WillOnce(Invoke([&](auto& entries) { entries = routeEntries; }));
+  // Mock the calls made by populateAggregatePortMap and populateVlanPortMap
+  EXPECT_CALL(getMockAgent(), getAllPortInfo(_))
+      .Times(2)
+      .WillRepeatedly(Invoke([&](auto& entries) { entries.clear(); }));
+  EXPECT_CALL(getMockAgent(), getAggregatePortTable(_))
+      .WillOnce(Invoke([&](auto& entries) { entries.clear(); }));
 
   auto cmd = CmdShowRouteDetails();
   std::vector<std::string> entries = {"2401:db00::/32", "176.161.6.0/32"};
@@ -221,6 +233,12 @@ TEST_F(CmdShowRouteDetailsTestFixture, queryIpRouteEntries) {
   EXPECT_CALL(getMockAgent(), getIpRouteDetails(_, _, _))
       .WillOnce(
           Invoke([&](auto& entry, auto, auto) { entry = routeEntries[0]; }));
+  // Mock the calls made by populateAggregatePortMap and populateVlanPortMap
+  EXPECT_CALL(getMockAgent(), getAllPortInfo(_))
+      .Times(2)
+      .WillRepeatedly(Invoke([&](auto& entries) { entries.clear(); }));
+  EXPECT_CALL(getMockAgent(), getAggregatePortTable(_))
+      .WillOnce(Invoke([&](auto& entries) { entries.clear(); }));
 
   auto cmd = CmdShowRouteDetails();
   std::vector<std::string> entries = {