[dut_console]: conditionally skip connect tests for arista 7800 chass…

…is (#15520)

Description of PR
Skip dut console connect tests for arista 7800 as the linecards do not have console ports

Summary:
Fixes #15518

Approach
What is the motivation for this PR?
Test was failing on setup due to no mgmt ip for console, as there isnt a console for the linecards

How did you do it?
conditionally skip for 7800 chassis

How did you verify/test it?
ran locally, tests are skipped

Any platform specific information?
arista 7800 specific

Signed-off-by: Liam Kearney <liamkearney@microsoft.com>

tests/common/plugins/conditional_mark/tests_mark_conditions.yaml

@@ -558,6 +558,18 @@ dut_console:
     conditions:
       - "asic_type in ['vs']"
 
+dut_console/test_console_baud_rate.py::test_baud_rate_boot_connect:
+  skip:
+    reason: "Platform linecards do not have console ports"
+    conditions:
+      - "asic_type in ['vs'] or 'arista_7800' in platform"
+
+dut_console/test_console_baud_rate.py::test_baud_rate_sonic_connect:
+  skip:
+    reason: "Platform linecards do not have console ports"
+    conditions:
+      - "asic_type in ['vs'] or 'arista_7800' in platform"
+
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