Added snapshot tests. #1820

Job	Run time
test-opensearch-spec (version=1.3.17, hub=opensearchproject, tests=default)	1m 22s
test-opensearch-spec (version=2.0.0, hub=opensearchproject, tests=default)	1m 20s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=default)	1m 49s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=plugins/index_state_management)	1m 22s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=plugins/ml)	1m 57s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=routing)	1m 19s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=snapshot)	55s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=dangling)	55s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=plugins/replication)	1m 10s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=plugins/streaming)	55s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=plugins/notifications)	57s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=plugins/query_insights)	52s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=plugins/workload-management)	1m 21s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=plugins/analysis)	1m 9s
test-opensearch-spec (version=2.19.0, hub=opensearchstaging, tests=default)	1m 40s
test-opensearch-spec (version=3.0.0, hub=opensearchstaging, tests=default)	1m 47s
merge-coverage	5s
	20m 55s

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