Infinite Scroll: Bust cache

[kraftbj]

Changes proposed in this Pull Request:

• Busts cache to stay in sync with WP.com.

The JS has some major differences, so this is just to keep the PHP in sync until the JS can be tackled.

Jetpack product discussion

See D54641-code

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

No

Testing instructions:

• None

Proposed changelog entry for your changes:

• n/a

[matticbot]

Caution: This PR has changes that must be merged to WordPress.com
Hello kraftbj! These changes need to be synced to WordPress.com - If you 're an a11n, please commandeer and confirm D55470-code works as expected before merging this PR. Once this PR is merged, please commit the changes to WP.com. Thank you!
This revision will be updated with each commit to this PR

[jetpackbot]

Scheduled Jetpack release: February 2, 2021.
Scheduled code freeze: January 25, 2021

Thank you for the great PR description!

When this PR is ready for review, please apply the [Status] Needs Review label. If you are an a11n, please have someone from your team review the code if possible. The Jetpack team will also review this PR and merge it to be included in the next Jetpack release.

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