Adds nvmrc file with recommended node version (#5831) #34030

Job	Run time
build	3m 21s
test-playwright-e2e-shard-1-of-2	5m 55s
test-upgrade-downgrade	1m 58s
aggregator_test	6m 38s
Upload assets	8s
Same wasms for mainnet and local	12s
test-playwright-e2e-shard-2-of-2	7m 6s
test-rest	3m 31s
test-upgrade-stable	1m 40s
test-test-account-api	1m 10s
build-pass	6s
	31m 45s

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