PHPCS: More class.jetpack.php

[kraftbj]

Supports #21952

Changes proposed in this Pull Request:

• More various PHPCS. Just chipping away and not wanting things to get stale with such a large file. This one is mainly "simple" things.

Jetpack product discussion

n/a

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

No.

Testing instructions:

• Review manually, run Jetpack.

[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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• ✅ Add a "[Status]" label (In Progress, Needs Team Review, ...).
  
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Jetpack plugin:

• Next scheduled release: June 7, 2022.
• Scheduled code freeze: May 31, 2022.

[sdixon194]

Looks good to me, just the above suggestion from Brad.