test: refactor mock setup in maven plugin tests (#2911) (CP: 24.5)

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```diff @@ Coverage Diff @@ ## 24.5 #2912 +/- ## ======================================= Coverage ? 92.24% ======================================= Files ? 81 Lines ? 2681 Branches ? 699 ======================================= Hits ? 2473 Misses ? 158 Partials ? 50 ``` | [Flag](https://app.codecov.io/gh/vaadin/hilla/pull/2912/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vaadin) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/vaadin/hilla/pull/2912/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vaadin) | `92.24% <ø> (?)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vaadin#carryforward-flags-in-the-pull-request-comment) to find out more.

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vaadin / hilla

test: refactor mock setup in maven plugin tests (#2911) (CP: 24.5) #2912

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