feat!: upgrade to `@sanity/ui` v2 #1577

Job	Run time
Log inputs	1s
Lint & Build	3m 1s
Node.js lts/* / macos-latest	2m 7s
Node.js lts/* / ubuntu-latest	22s
Node.js lts/* / windows-latest	2m 4s
Node.js lts/-2 / ubuntu-latest	27s
Node.js current / ubuntu-latest	27s
Semantic release	1s
	8m 30s

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