Replace `XCNSPredicateExpectation` with faster Nimble alternative

[mokagio]

Resolves #19080.

To test: If the UI tests pass in CI, we're good.

Regression Notes

1. Potential unintended areas of impact – The editor UI tests
2. What I did to test those areas of impact (or what existing automated tests I relied on) – Checked that the tests passed in CI
3. What automated tests I added (or what prevented me from doing so) – N.A.

---

• [x] I have completed the Regression Notes.
• [x] I have considered adding unit tests for my changes. N.A.
• [x] I have considered adding accessibility improvements for my changes. N.A.
• [x] I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary. N.A.

[wpmobilebot]

You can test the changes in Jetpack from this Pull Request by:

• Clicking here or scanning the QR code below to access App Center
• Then installing the build number pr19152-9a40b93 on your iPhone

If you need access to App Center, please ask a maintainer to add you.

[wpmobilebot]

You can test the changes in WordPress from this Pull Request by:

• Clicking here or scanning the QR code below to access App Center
• Then installing the build number pr19152-9a40b93 on your iPhone

If you need access to App Center, please ask a maintainer to add you.