Fix new ESM loader runtime by moving to abs URLs #1870

Job	Run time
Flow	1m 44s
Lint	3m 48s
Benchmarks	39m 58s
Integration tests (ubuntu-latest, Node 14)	18m 49s
Integration tests (macos-latest, Node 14)	31m 51s
Integration tests (windows-latest, Node 14)	18m 55s
Integration tests (ubuntu-latest, Node 16)	19m 17s
Integration tests (macos-latest, Node 16)	29m 58s
Integration tests (windows-latest, Node 16)	24m 34s
Unit tests (ubuntu-latest, Node 14)	17m 46s
Unit tests (macos-latest, Node 14)	27m 36s
Unit tests (windows-latest, Node 14)	25m 57s
Unit tests (ubuntu-latest, Node 16)	15m 13s
Unit tests (macos-latest, Node 16)	29m 11s
Unit tests (windows-latest, Node 16)	23m 15s
Test report	2s
	5h 27m 54s

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