[action] [PR:14713] [T2] [Chassis] Skip override_config_table_masic test for upstream line card

[mssonicbld]

Description of PR

Summary:
Fixes # (issue)
This PR fixes 'test_override_config_table_masic-test_load_minigraph_with_golden_config' failure on upstream line card on T2 topo Chassis.

The above test fails with the following issue on DEVICE_METADATA table when 'config load_minigraph' is done with empty golden config input.

host_current_config = get_running_config(duthost)
for table in initial_host_config:
if table in NON_USER_CONFIG_TABLES:
continue
pytest_assert(
initial_host_config[table] == host_current_config[table],
"empty input compare fail! {}".format(table)
)
E Failed: empty input compare fail! DEVICE_METADATA

The test passes on downstream linecards.

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?

• 'test_override_config_table_masic-test_load_minigraph_with_golden_config' fails on upstream line card on T2 topo Chassis.
• 'subtype' changes to 'DownstreamLC' from 'UpstreamLC' in DEVICE_METADATA for Upstream LC after load_minigraph with empty golden_config as input.

How did you do it?

• Skip the empty input golden config check for upstream line card and do the other checks for upstream line card.
• Perform the empty input test only if it is downstream line card and verify the golden config functionality.

How did you verify/test it?

Run 'test_override_config_table_masic-test_load_minigraph_with_golden_config' on T2 chassis and verify the test passes without any issues.

Any platform specific information?

Supported testbed topology if it's a new test case?

Documentation

[mssonicbld]

Original PR: #14713