[Chassis] ignore log analyzers on config reload/reboot, and bfd test

[yejianquan]

Description of PR

Summary:
Fixes MSFT PBI#30938349

Type of change

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

Back port request

• 202012
• 202205
• 202305
• 202311
• 202405
• 202411

Approach

What is the motivation for this PR?

1. Ignore the err logs during loganalyzer analyzer on config_reload and reboot, so that we can enable log analyzer on other codes beyond config reload/reboot, rather than skip on all of the test module.
2. Ignore err logs in bfd_static_route tests

How did you do it?

1. Ignore the err logs during loganalyzer analyzer on config_reload and reboot, so that we can enable log analyzer on other codes beyond config reload/reboot, rather than skip on all of the test module.
2. Ignore err logs in bfd_static_route tests

How did you verify/test it?

Verified on physical chassis testbeds

Any platform specific information?

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

Documentation

[mssonicbld]

/azp run

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