[platform_tests/counterpoll]: Don't run counterpoll_watermark test on supervisor

[liamkearney-msft]

• Select only frontend hwskus for counterpoll_queue_watermark_pg_drop test
• Assert if waiting for COUNTER_DB to be populated fails

BugLink: #14721

Summary:
Fixes #14721

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?

platform test test_counterpoll_watermark_pg_drop runs and fails on the sup cards, where it should only be running on linecards. Test case fixture needs to be modified to only select frontend cards. Additionally, the test should fail if it fails to wait on the COUNTER_DB on becoming populated

How did you do it?

How did you verify/test it?

Run on testbed - successfully skips supervisor, and asserts properly if the counter_db is not populated

Any platform specific information?

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

Documentation

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: liamkearney-msft (1585488)

[mssonicbld]

The pre-commit check detected issues in the files touched by this pull request.
The pre-commit check is a mandatory check, please fix detected issues.

Detailed pre-commit check results:
trim trailing whitespace.................................................Passed
fix end of files.........................................................Passed
check yaml...........................................(no files to check)Skipped
check for added large files..............................................Passed
check python ast.........................................................Passed
flake8...................................................................Failed
- hook id: flake8
- exit code: 1

tests/platform_tests/counterpoll/test_counterpoll_watermark.py:128:21: E128 continuation line under-indented for visual indent

flake8...............................................(no files to check)Skipped
check conditional mark sort..........................(no files to check)Skipped

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