System health fix

[mashetta-cisco]

Description of PR

Summary:
The killed process fault can appear before the summary field or the LED state can update. This can result in the test failing with the result;

System status LED is not yellow, amber, or red, but it is green

This diff adds an LED time constraint to wait for SYSTEM_HEALTH_INFO.summary to become Not OK, instead of an immediate read. The LED state is then polled for 60s, every 5 seconds.

If the LED state hasn't converged after the poll, the test fails

Type of change

• [ x] Bug fix
• Testbed and Framework(new/improvement)
• New Test case
  • Skipped for non-supported platforms
• [ x] Test case improvement

Back port request

• 202205
• 202305
• 202311
• 202405
• 202411
• 202505
• [ x] 202511

Approach

What is the motivation for this PR?

test_service_checker_with_process_exit would intermittently fail when the process failure is detected before the CLI and the LED had converged.

How did you do it?

Changed the test to wait for SYSTEM_HEALTH_INFO.summary to become Not OK and then poll LED state.

How did you verify/test it?

Manually ran the tests.

Any platform specific information?

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

Documentation

[mssonicbld]

/azp run

[linux-foundation-easycla]

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