[action] [PR:19989] Check for comments in sai.profile lines in the test_link_local_ip.py

[mssonicbld]

Description of PR

Summary:
The issue is the loop at:

 sai_profile = "/usr/share/sonic/device/{}/{}/sai.profile".format(platform, hwsku)
 for line in duthost.command("cat %s" % sai_profile)["stdout_lines"]:
 key, value = line.split("=")
 sai_settings[key] = value

The check in line.split() fails if there is a comment line in the sai.profile. This PR updates the loop to ignore the comment lines and lines without a = sign.

Type of change

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

Back port request

• 202205
• 202305
• 202311
• 202405
• 202411
• 202505

Approach

What is the motivation for this PR?

Pls see the description.

[mssonicbld]

Original PR: #19989

[mssonicbld]

/azp run

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