VaultPress: Remove obsolete hotfixes

[miguelxpn]

Changes proposed in this Pull Request:

• Removed old obsolete hotfixes

Jetpack product discussion

• Internal reference: p3btAN-1xz-p2

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

• No

Testing instructions:

• Activate VaultPress and make sure that no error pops up.

[github-actions]

Thank you for your PR!

When contributing to Jetpack, we have a few suggestions that can help us test and review your patch:

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Vaultpress plugin:

• Next scheduled release: November 2, 2021.
• Scheduled code freeze: October 25, 2021.

[jeherve]

This looks good to me. It's always good to see so much red in a diff :)