Deprecate downlevelIteration (#63071) #35254

Job	Run time
format	24s
lint	1m 0s
knip	30s
typecheck	44s
coverage	10m 2s
smoke	54s
misc	25s
baselines	9m 8s
self-check	57s
browser-integration	1m 24s
Test Node 20 on ubuntu-latest	10m 37s
Test Node 22 on windows-latest	13m 17s
Test Node 24 on windows-latest	10m 7s
Test Node 24 on ubuntu-latest	7m 55s
Test Node 22 on ubuntu-latest	9m 44s
Test Node 16 on macos-latest	10m 42s
Test Node 18 on ubuntu-latest	11m 49s
Test Node lts/* on ubuntu-latest with --no-bundle	10m 49s
Test Node 14 on windows-latest	14m 20s
Test Node 16 on windows-latest	14m 22s
Test Node 16 on ubuntu-latest	11m 16s
Test Node 24 on macos-latest	14m 56s
Test Node 18 on windows-latest	13m 41s
Test Node 20 on windows-latest	12m 36s
Test Node 14 on ubuntu-latest	11m 52s
package-size	0s
required	2s
	3h 23m 33s

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