frontend: use webp thumbnails #3508

Job	Run time
danger	14s
lint (18.x, frontend)	58s
lint (18.x, api)	24s
lint (18.x, blockchain)	15s
lint (18.x, provisioning)	13s
audit (18.x, frontend)	44s
audit (18.x, api)	36s
audit (18.x, blockchain)	15s
audit (18.x, provisioning)	11s
audit (18.x, e2e-test)	20s
audit (18.x, excel-export-service)	13s
audit (18.x, email-notification-service)	19s
audit (18.x, storage-service)	21s
audit (18.x, logging-service)	11s
audit (18.x, frontend-collector)	9s
audit (18.x, migration)	11s
test (18.x, frontend)	1m 13s
test (18.x, api)	24s
build (frontend)	2m 45s
build (api)	1m 52s
build (blockchain)	59s
build (provisioning)	1m 3s
build (e2e-test)	1m 27s
build (excel-export-service)	1m 1s
build (email-notification-service)	1m 44s
build (storage-service)	1m 19s
build (frontend-collector)	58s
build (migration)	1m 5s
notification	7s
	21m 31s

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