Remove sendapimoveannouncement management command

[sarayourfriend]

Fixes

Follow up to #4229 by @sarayourfriend

Description

The emails are sent as of 2024-05-08T00:59:58.366Z.

Testing Instructions

N/A. CI should pass, just deleting files here.

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
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• I added or updated tests for the changes I made (if applicable).
• [N/A] I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.

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