Added missing index on validator_cumulative_emission_history #2278

Job	Run time
setup-tags	6s
build	1m 17s
sonarcloud	2m 55s
snyk scan	1m 13s
AMD Migration / build-and-push	2m 7s
AMD Aggregator / build-and-push	2m 23s
ARM Migration / build-and-push	3m 15s
ARM Aggregator / build-and-push	3m 16s
AMD Gateway / build-and-push	2m 47s
ARM Gateway / build-and-push	3m 20s
Migration / Join Image	11s
Aggregator / Join Image	19s
Gateway / Join Image	14s
deploy-pr	14s
ephemeral-deploy-and-test	0s
deploy-on-mardunet	0s
	23m 37s

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