Add unit tests for isSecureDbgSrvUnlocked gating logic

[Copilot]

The new isSecureDbgSrvUnlocked ePROD unlock path (requires isDebugServicesEnabled RFC + deviceType == "test" RFC + LABSIGNED_ENABLED == "true") had no test coverage. Two existing GetServURL PROD+DebugEnabled tests were also broken by the new logic since they only mocked isDebugServicesEnabled without satisfying the additional LABSIGNED/deviceType conditions.

New tests — isSecureDbgSrvUnlocked

Seven tests covering all gate combinations directly against isSecureDbgSrvUnlocked(BUILDTYPE):

Scenario	Expected
Non-PROD (eVBN)	unlocked
ePROD + labsigned=true + deviceType=test + dbgServices=true	unlocked
ePROD + labsigned=true + deviceType=prod	locked
ePROD + labsigned=true + deviceType=unknown	locked
ePROD + labsigned=false	locked
ePROD + labsigned=true + deviceType=test + dbgServices=false	locked
ePROD + getDevicePropertyData fails (-1)	locked

TEST_F(DeviceApiTestFixture, TestName_isSecureDbgSrvUnlocked_Prod_Labsigned_DeviceTypeTest_DbgEnabled)
{
    EXPECT_CALL(*g_DeviceUtilsMock, isDebugServicesEnabled()).Times(1).WillOnce(Return(true));
    EXPECT_CALL(*g_DeviceUtilsMock, getDeviceTypeRFC(_, _))
        .Times(1)
        .WillOnce(Invoke([](char* deviceType, size_t size) {
            strncpy(deviceType, "test", size - 1);
            deviceType[size - 1] = '\0';
        }));
    EXPECT_CALL(*g_DeviceUtilsMock, getDevicePropertyData(StrEq("LABSIGNED_ENABLED"), _, _))
        .Times(1)
        .WillOnce(Invoke([](const char*, char* data, int size) {
            strncpy(data, "true", size - 1);
            data[size - 1] = '\0';
            return 0;
        }));
    EXPECT_TRUE(isSecureDbgSrvUnlocked(ePROD));
}

Fixed tests — GetServURL PROD+DebugServices_Enabled

TestName_GetServURL_SuccessStatered_Prod_DebugServices_Enabled and TestName_GetServURL_SuccessSwupdate_Prod_DebugServices_Enabled now mock getDeviceTypeRFC (→ "test") and getDevicePropertyData("LABSIGNED_ENABLED") (→ "true") to satisfy the full unlock gate, restoring the intended test behavior.

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