chore: use the stripped down version of `setup-unity` #9038

Job	Run time
cancel-previous-workflow	3s
UPM Package validation	6m 46s
sdk (Windows, windows-latest) / build	1m 15s
Build Unity SDK (2021.3) / Build - 2021.3	7m 29s
sdk (Android, ubuntu-latest) / build	50s
sdk (Cocoa, macos-latest) / build	1m 9s
create-unity-matrix / create-unity-matrix	3s
sdk (Linux, ubuntu-latest) / build	42s
Create 6000.3 Test Project / 6000.3	10s
Create 2022.3 Test Project / 2022.3	13s
Create 6000.0 Test Project / 6000.0	16s
Build Windows 2022.3 Integration Test / Windows 2022.3	15m 57s
Build Windows 6000.3 Integration Test / Windows 6000.3	19m 32s
Build Windows 6000.0 Integration Test / Windows 6000.0	15m 39s
Build Android ${{ matrix.unity-version }} Test	-1s
Build iOS ${{ matrix.unity-version }} Test	-1s
Compile iOS ${{ matrix.unity-version }} Test	0s
Build ${{ matrix.platform }} ${{ matrix.unity-version }} Test	-1s
Run Android ${{ matrix.unity-version }} Integration Test	0s
Build Linux ${{ matrix.unity-version }} Integration Test	-1s
Run Linux ${{ matrix.unity-version }} Integration Test	0s
Run iOS ${{ matrix.unity-version }} Integration Test	0s
Run WebGL ${{ matrix.unity-version }} Integration Test	0s
Build Size	7s
Run Windows 2022.3 Integration Test / windows 2022.3	2m 12s
Run Windows 6000.3 Integration Test / windows 6000.3	1m 31s
Run Windows 6000.0 Integration Test / windows 6000.0	1m 12s
	1h 15m 2s

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