test: remove webdriver-manager repo postinstall #2663

Job	Run time
list	19s
workflow (devkit-core-tests)	1m 24s
workflow (modules-builder-tests)	1m 52s
workflow (devkit-core-tests-rerun)	1m 15s
workflow (build-cli)	1m 40s
workflow (build-unit-tests)	2m 16s
	8m 46s

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