Skip adding Premium or Ultimate pills if issue/epic is labeled as Core or Free

Why is this change being made?

Related to this issue: #14561 (closed) and related slack discussions. There is some expectation that if an issue or epic contains GitLab Free and higher tier labels like GitLab Premium then the Premium or Ultimate labels should not be shown. That is, the highest tiers are implied if the feature is in the free tier.

This MR adds a short-circuit in the direction generator to skip adding those pills to rendered page, /upcoming-releases.

Incoming Changes

Current Behavior

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
  • Copy/paste the Slack conversation to document it for later, or upload screenshots. Verify that no confidential data is added, and the content is SAFE
• Assign reviewers for this MR to the correct Directly Responsible Individual/s (DRI)
  • If the DRI for the page/s being updated isn’t immediately clear, then assign it to one of the people listed in the Maintained by section on the page being edited
  • If your manager does not have merge rights, please ask someone to merge it AFTER it has been approved by your manager in #mr-buddies
  • The when to get approval handbook section explains the workflow in more detail
• 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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