Add migration tests #889

Job	Run time
build (production)	2m 12s
build (test)	2m 6s
End to End testing (3.0)	2m 45s
End to End testing (3.1)	2m 57s
Testing search (3.0, docker.elastic.co/elasticsearch/elasticsearch:7.17.13)	2m 8s
test (3.0)	9m 46s
End to End testing (.ruby-version)	2m 59s
Testing search (3.1, docker.elastic.co/elasticsearch/elasticsearch:7.17.13)	2m 14s
test (3.1)	9m 32s
Testing search (.ruby-version, docker.elastic.co/elasticsearch/elasticsearch:7.17.13)	1m 56s
test (.ruby-version)	11m 20s
Testing search (.ruby-version, docker.elastic.co/elasticsearch/elasticsearch:8.10.2)	2m 27s
	52m 22s

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