Revert "Update yoast/phpunit-polyfills requirement from ^1.0 to ^2.0 in /build-phpunit"

[mukeshpanchal27]

Reverts #497

After the merge the unit tests goes failed so need some more debugging.

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[swissspidy]

Confused, where are they failing? 🤔

[swissspidy]

Ah, I see one failure now regarding the --verbose option which was removed in PHPUnit 10.

Let's just remove this argument then? 🤔

[mukeshpanchal27]

I did that in local system and got similar error shown here https://github.com/WordPress/plugin-check/actions/runs/9837501136/job/27155469465?pr=512

[swissspidy]

Yeah seeing it now too. Just strange that a PR like this one does not trigger unit tests, otherwise we would have caught this before merging.