chore: Freezes github codeowners and rm pizza action

[jpmcb]

Description

This removes the pizza.yaml workflow which would update the codeowners every week. This in essence should "freeze" the owners (which we may then re-evaluate in the future).

This is in order to reduce touchpoints in this repo.

Related Tickets & Documents

N/a

Tier (staff will fill in)

• [ ] Tier 1
• [ ] Tier 2
• [ ] Tier 3
• [x] Tier 4

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