Fix MockPlugin behavior in tests (#25461)

### Details:
 - Fix MockPlugin behavior in tests

### Tickets:
 - CVS-134410

Author: olpipi

.github/workflows/linux_sanitizers.yml

@@ -286,7 +286,7 @@ jobs:
                 --gtest_output=xml:${INSTALL_TEST_DIR}/TEST-OVCoreUT.xml
 
       - name: OpenVINO Inference Functional Tests
-        if: ${{ 'false' }} # Ticket: 134410
+        if: always()
         run: |
           source ${INSTALL_DIR}/setupvars.sh
 

src/inference/tests/functional/ov_register_plugin_test.cpp

@@ -26,7 +26,8 @@ using namespace std;
 
 #ifndef OPENVINO_STATIC_LIBRARY
 
-inline void mockPlugin(ov::Core& core, std::shared_ptr<ov::IPlugin>& plugin, std::shared_ptr<void>& m_so) {
+namespace {
+void mockPlugin(ov::Core& core, std::shared_ptr<ov::IPlugin>& plugin, std::shared_ptr<void>& m_so) {
     std::string libraryPath = ov::test::utils::get_mock_engine_path();
     if (!m_so)
         m_so = ov::util::load_shared_object(libraryPath.c_str());
@@ -36,6 +37,12 @@ inline void mockPlugin(ov::Core& core, std::shared_ptr<ov::IPlugin>& plugin, std
     injectProxyEngine(plugin.get());
 }
 
+void clearMockPlugin(const std::shared_ptr<void>& m_so) {
+    ASSERT_TRUE(m_so);
+    ov::test::utils::make_std_function<void()>(m_so, "ClearTargets")();
+}
+}  // namespace
+
 TEST(RegisterPluginTests, getVersionforRegisteredPluginThrows) {
     ov::Core core;
     auto plugin = std::make_shared<ov::test::utils::MockPlugin>();
@@ -49,6 +56,7 @@ TEST(RegisterPluginTests, getVersionforRegisteredPluginThrows) {
                                            std::string("mock_registered_engine") + OV_BUILD_POSTFIX),
         mock_plugin_name));
     ASSERT_THROW(core.get_versions("MOCK_REGISTERED_HARDWARE"), ov::Exception);
+    clearMockPlugin(m_so);
 }
 
 TEST(RegisterPluginTests, getVersionforNoRegisteredPluginNoThrows) {
@@ -113,6 +121,7 @@ TEST(RegisterPluginTests, registerExistingPluginThrows) {
                                                                          std::string("mock_engine") + OV_BUILD_POSTFIX),
                                       mock_plugin_name),
                  ov::Exception);
+    clearMockPlugin(m_so);
 }
 
 inline std::string getPluginFile() {

src/tests/test_utils/unit_test_utils/mocks/mock_engine/mock_plugin.cpp

@@ -190,3 +190,8 @@ OPENVINO_PLUGIN_API void InjectPlugin(ov::IPlugin* target) {
     std::lock_guard<std::mutex> lock(targets_mutex);
     targets.push(std::make_shared<MockInternalPlugin>(target));
 }
+
+OPENVINO_PLUGIN_API void ClearTargets() {
+    std::lock_guard<std::mutex> lock(targets_mutex);
+    targets = {};
+}