labels rendering performance improvement: create ImageBitmaps in worker #6441

Job	Run time
modified-files	38s
teams	0s
e2e / test-e2e	4m 22s
build / changes	20s
lint / eslint	3m 5s
test / test-app	2m 35s
build / build	3m 30s
test / test-python (ubuntu-latest-m, 3.9)	4m 4s
test / test-python (ubuntu-latest-m, 3.10)	4m 21s
test / test-python (ubuntu-latest-m, 3.11)	4m 21s
all-tests	1s
	27m 17s

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