refactor: remove missed redundant computation of `projectRoot` #5441

Job	Run time
Checks	0s
Add PR to project	2s
Checks	4m 44s
Tests (macos-13, ./fixtures/*)	6m 40s
Tests (macos-13, ./packages/*)	9m 33s
Tests (ubuntu-latest, ./fixtures/*)	4m 14s
Tests (ubuntu-latest, ./packages/*)	3m 36s
Tests (ubuntu-latest, ./tools)	43s
Tests (windows-latest, ./fixtures/*)	7m 18s
Tests (windows-latest, ./packages/*)	6m 1s
	42m 51s

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