[NPU][IE-MDK] Load testing skip config at runtime (#29056)

### Details:
- Adds a mechanism to load and parse an xml file containing all test
skips
- Defines skip enabling "rules": a user can select if a skip is applied
depending on OS, Platform number or Backend type
- Rules are optional. Users can negate a rule by using "!" and they can
add as many rules as needed
 - Skip filters and rules are grouped in the following format:
```
<skip_config>
    <message> Provide reason why these tests are skipped </message>
    <enable_rules> <-- rules section starts here -->
        <backend>LEVEL0</backend>
        <backend>IMD</backend>
        <backend></backend>  (empty backend)
        <device>3720</device>
        <device>4000</device>
        <operating_system>windows</operating_system>
        <operating_system>linux</operating_system>
    </enable_rules>
    <filters> <-- skip filters section starts here -->
        <filter>skip this test 1</filter>
        <filter>skip this test 2</filter>
        <filter>skip this test 3</filter>
    </filters>
</skip_config>
```

Functionality is enabled by setting OV_NPU_TESTS_SKIP_CONFIG_FILE
environment variable with the correct path, the file will be loaded and
parsed.
However, if the path is left empty the application will use the legacy
skip filters as configured in skip_tests_config.cpp

### Tickets:
 - EISW-142588

---------

Signed-off-by: Sorin Butnariu <sorin.butnariu@intel.com>
Co-authored-by: Bogdan Pereanu <bogdan.pereanu@intel.com>

Author: sbutnari

src/plugins/intel_npu/tests/functional/CMakeLists.txt

@@ -14,6 +14,9 @@ set(EXCLUDED_FUNC_TESTS_DIR "")
 set(OPTIONAL_FUNC_TESTS_INCLUDES "")
 set(OPTIONAL_FUNC_TESTS_LIBS "")
 
+set(SKIP_CONFIG "skip_tests.xml")
+set(SKIP_CONFIG_PATH ${CMAKE_CURRENT_SOURCE_DIR}/shared_tests_instances/${SKIP_CONFIG})
+
 list(APPEND OPTIONAL_FUNC_TESTS_INCLUDES
       "${OpenVINO_SOURCE_DIR}/src/plugins/intel_npu/src/compiler_adapter/include")
 
@@ -66,3 +69,9 @@ install(
   RUNTIME DESTINATION tests
           COMPONENT tests
           EXCLUDE_FROM_ALL)
+
+install(
+  FILES ${SKIP_CONFIG_PATH}
+  DESTINATION tests
+  COMPONENT tests
+  EXCLUDE_FROM_ALL)

src/plugins/intel_npu/tests/functional/common/npu_test_env_cfg.cpp

@@ -134,6 +134,10 @@ NpuTestEnvConfig::NpuTestEnvConfig() {
     if (auto var = std::getenv("IE_NPU_TESTS_PLATFORM")) {
         IE_NPU_TESTS_PLATFORM = var;
     }
+
+    if (auto var = std::getenv("OV_NPU_TESTS_SKIP_CONFIG_FILE")) {
+        OV_NPU_TESTS_SKIP_CONFIG_FILE = var;
+    }
 }
 
 const NpuTestEnvConfig& NpuTestEnvConfig::getInstance() {

src/plugins/intel_npu/tests/functional/common/npu_test_env_cfg.hpp

@@ -26,6 +26,7 @@ class NpuTestEnvConfig {
     std::string IE_NPU_TESTS_DUMP_PATH;
     std::string IE_NPU_TESTS_LOG_LEVEL;
     std::string IE_NPU_TESTS_PLATFORM;
+    std::string OV_NPU_TESTS_SKIP_CONFIG_FILE;
 
     bool IE_NPU_TESTS_RUN_COMPILER = true;
     bool IE_NPU_TESTS_RUN_EXPORT = false;