Fix customMsg from unexpected fanity failure (#14792)

New feature delivered recently, add customMsg for sanity check failures, was causing unexpected sanity_check results. This was due to premature cache key reset of pre_sanity_check_failed and post_sanity_check_failed. Removed those two keys from getting reset before sessionfinish to resolve the issue

Important cache keys, used to determine session exit status:
pre_sanity_check_failed & post_sanity_check_failed => These combination of keys will return exit status 10, 11, 12
10 = PRE_SANITY_CHECK_FAILED_RC
11 = POST_SANITY_CHECK_FAILED_RC
12 = SANITY_CHECK_FAILED_RC

duthosts_fixture_failed => If this is true, we return exit status code 15
15 = DUTHOSTS_FIXTURE_FAILED_RC

Description of PR
Summary:
New feature delivered recently, add customMsg for sanity check failures, was causing unexpected sanity_check results. This was due to premature cache key reset of pre_sanity_check_failed and post_sanity_check_failed. Removed those two keys from getting reset before sessionfinish to resolve the issue

Type of change
 Bug fix
 Testbed and Framework(new/improvement)
 Test case(new/improvement)
Back port request
 202012
 202205
 202305
 202311
 202405
Approach
What is the motivation for this PR?
How did you do it?
Remove premature cache reset of pre_sanity_check_failed and post_sanity_check_failed, before it reaches sessionfinish

How did you verify/test it?
Manually tested, simulating pre_sanity_checked_failed and post_sanity_check_failed, to observe expected exit satus codes from 10,11, and 12.
Exit status code can be retrieved and displayed, using 'echo $?'
eg:
image

co-authorized by: [email protected]

tests/common/plugins/sanity_check/__init__.py

@@ -19,15 +19,9 @@
 SUPPORTED_CHECKS = checks.CHECK_ITEMS
 DUT_CHEK_LIST = ['core_dump_check_pass', 'config_db_check_pass']
 CACHE_LIST = ['core_dump_check_pass', 'config_db_check_pass',
-              'pre_sanity_check_failed', 'post_sanity_check_failed',
               'pre_sanity_recovered', 'post_sanity_recovered']
 
 
-def reset_cache_list(request):
-    for item in CACHE_LIST:
-        request.config.cache.set(item, None)
-
-
 def pytest_sessionfinish(session, exitstatus):
 
     pre_sanity_failed = session.config.cache.get("pre_sanity_check_failed", None)
@@ -170,8 +164,6 @@ def log_custom_msg(request):
                 logger.debug("customMsgDict: {}".format(customMsgDict))
                 item.user_properties.append(('CustomMsg', json.dumps(customMsgDict)))
 
-    reset_cache_list(request)
-
 
 @pytest.fixture(scope="module")
 def sanity_check_full(localhost, duthosts, request, fanouthosts, nbrhosts, tbinfo):