Make error message for port group facts gathering more descriptive

[stalabi1]

SUMMARY

I made the error message for port group facts gathering more descriptive to accommodate platforms that don't support the feature.

GitHub Issues

List the GitHub issues impacted by this PR. If no Github issues are affected, please indicate this with "N/A".\

GitHub Issue #
#387

ISSUE TYPE

• Feature Pull Request

COMPONENT NAME

sonic_port_group

OUTPUT

facts_gathering.log
regression-2024-06-12-15-13-17.html.pdf

Checklist:

• I have performed a self-review of my own code to ensure there are no formatting, linting, or security issues
• I have verified that new and existing unit tests pass locally with my changes
• I have not allowed coverage numbers to degenerate
• I have maintained at least 90% code coverage
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have maintained backward compatibility or have provided any relevant "breaking_changes" descriptions in a "fragment" file in the "changelogs/fragments" directory of this repository.
• I have provided a summary for this PR in valid "fragment" file format in the "changelogs/fragments" directory of this repository branch. Reference : Ansible Change Log Document

[kerry-meyer]

Thank you for providing this enhancement to our functionality for querying facts on "all" resource modules on a platform that doesn't support port groups.

The proposed code changes and test results look good.

Approved.