Updating list of supported operating systems

Why is this change being made?

This change is being made to update the existing list of supported operating systems. In particular, for Linux workstations, this list will provide enhanced asset management and security for those systems, which aren't currently being protected by our EDR solution.

We would target all users to be on a supported distribution by October 31, 2022, to allow for testing and deploying of the EDR agent before end of 2022.

Author Checklist

• Provided a concise title for this Merge Request (MR)
• Added a description to this MR explaining the reasons for the proposed change, per say why, not just what
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• If the changes affect team members, or warrant an announcement in another way, please consider posting an update in #whats-happening-at-gitlab linking to this MR
  • If this is a change that directly impacts the majority of global team members, it should be a candidate for #company-fyi. Please work with internal communications and check the handbook for examples.

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