Update starter tiers for Compliance group

What does this MR do?

@mattgonzales This should be straightforward. With the elimination of "STARTER*" tiers, we need to update our docs to name the new tier. In most cases, I understand the move is from "STARTER" -> "PREMIUM", but not always. If I understand https://gitlab.com/gitlab-com/packaging-and-pricing/pricing-handbook/-/issues/197 correctly, in a few cases we might go from "STARTER" -> "FREE".

This is your chance to let me know.

Until features.yml is updated, my understanding is that the docs will be the SSoT for tiers.

Issue: technical-writing#344 (closed)

Related issues

Author's checklist (required)

• Follow the Documentation Guidelines and Style Guide.
• If you have Developer permissions or higher:
  • Ensure that the product tier badge is added to doc's h1.
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