improve readability of sync output

[columbian-chris]

Description of the Change

Closes #3987

How to test the Change

Do a sync via WP-CLI, notice change in output.

Output example (before):

...
Processed posts 40050 - 40200 of 571364. Last Object ID: 2444285
Processed posts 40200 - 40350 of 571364. Last Object ID: 2443651
Processed posts 40350 - 40500 of 571364. Last Object ID: 2443046
Time elapsed: 00:11:14.980000 (+26.058)
Memory Usage: 4978.59mb (Peak: 4982.8mb)
Processed posts 40500 - 40650 of 571364. Last Object ID: 2442462
Processed posts 40650 - 40800 of 571364. Last Object ID: 2441899
Processed posts 40800 - 40950 of 571364. Last Object ID: 2441234
...

Output example (after):

...
Processed posts 34,050 - 34,200 of 571,364. Last Object ID: 2467260
Processed posts 34,200 - 34,350 of 571,364. Last Object ID: 2466652
Processed posts 34,350 - 34,500 of 571,364. Last Object ID: 2466098
Time elapsed: 00:09:26.950000 (+24.593)
Memory Usage: 4.15gb (Peak: 4.15gb)
Processed posts 34,500 - 34,650 of 571,364. Last Object ID: 2465535
Processed posts 34,650 - 34,800 of 571,364. Last Object ID: 2464943
Processed posts 34,800 - 34,950 of 571,364. Last Object ID: 2464404
...

Changelog Entry

Changed - Existing functionality

Credits

Props @columbian-chris

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added Critical Flows, Test Cases, and/or End-to-End Tests to cover my change.
• All new and existing tests pass.

[columbian-chris]

Sorry, I meant PHPCS, not eslint.