JupyterLab 4.0 migration #1539

Job	Run time
jstest/lint (ubuntu, >=16,<17.0.0a0, >=4.0.5,<5.0.0a0, >=4)	9m 43s
build (ubuntu, >=16,<17.0.0a0, >=4.0.0,<5.0.0a0, >=4)	4m 40s
smoke source install ubuntu py3.8 lab>=4,<5	2m 56s
smoke source install ubuntu py3.11 lab>=4,<5	2m 19s
atest ubuntu py3.8 r>=4	1h 6m 27s
atest ubuntu py3.11 r>=4	1h 6m 28s
atest macos py3.8 r>=4	1h 2m 57s
atest macos py3.11 r>=4	1h 6m 23s
atest windows py3.8 r>=4	1h 2m 9s
atest windows py3.11 r>=4	1h 3m 9s
smoke ubuntu py3.8	50s
smoke ubuntu py3.11	32s
smoke ubuntu pypypy-3.8	1m 24s
smoke macos py3.8	1m 6s
smoke macos py3.11	1m 9s
smoke macos pypypy-3.8	1m 18s
smoke windows py3.8	1m 26s
smoke windows py3.11	1m 25s
smoke windows pypypy-3.8	7m 9s
	7h 3m 30s

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