✨ Add helping pods via Slack to prioritization

Why is this change being made?

The guidance on prioritizing work does not account for replying to requests for help in the Slack channels used for Support Pods.

The Support Pods are an important tool that Support Engineers use for technical assistance from within the GitLab Support team. Currently, the guidance on prioritizing work does not account for how the Slack channels for pods are used for folks seeking guidance on a ticket. This MR aims to adjust that.

This MR also adjusts the text to refer to Support Pods given the naming convention.

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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