Port UI tests to vscode-extension-tester and remove wdio #2924

Job	Run time
lint	24s
test (1.92.2, windows-latest)	2m 14s
test (1.92.2, macos-latest)	1m 32s
test (1.92.2, ubuntu-latest)	1m 21s
test (insiders, windows-latest)	2m 7s
test (insiders, macos-latest)	1m 59s
test (insiders, ubuntu-latest)	1m 24s
test (stable, windows-latest)	2m 14s
test (stable, macos-latest)	1m 53s
test (stable, ubuntu-latest)	1m 23s
	16m 31s

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