Repo Gardening: remove heysatellite @mention

[jeherve]

Proposed changes:

It is no longer monitored.

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

• p1737090298620619-slack-C07418EJ0

Does this pull request change what data or activity we track or use?

No

Testing instructions:

Not much to test here, just removing a keyword

[github-actions]

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