Remove ES5 references, misc cleanup #35187

Job	Run time
typecheck	45s
self-check	56s
browser-integration	1m 39s
format	28s
package-size	1m 32s
misc	25s
coverage	11m 6s
knip	30s
lint	55s
baselines	9m 12s
smoke	57s
Test Node 24 on ubuntu-latest	8m 6s
Test Node 22 on ubuntu-latest	10m 10s
Test Node 24 on macos-latest	11m 46s
Test Node 22 on windows-latest	12m 8s
Test Node 24 on windows-latest	11m 8s
Test Node 18 on windows-latest	14m 21s
Test Node 20 on ubuntu-latest	10m 26s
Test Node 16 on ubuntu-latest	11m 1s
Test Node 16 on macos-latest	14m 4s
Test Node 14 on ubuntu-latest	12m 20s
Test Node lts/* on ubuntu-latest with --no-bundle	9m 57s
Test Node 14 on windows-latest	14m 17s
Test Node 16 on windows-latest	13m 30s
Test Node 18 on ubuntu-latest	11m 13s
Test Node 20 on windows-latest	12m 20s
required	3s
	3h 25m 15s

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