Support list for `opensearch_version` in PluginStats #548

Job	Run time
YAML Tests (Released OpenSearch) (2.12.0)	4m 30s
YAML Tests (Unreleased OpenSearch) (1.x)	3m 10s
YAML Tests (Released OpenSearch) (2.11.1)	3m 45s
YAML Tests (Unreleased OpenSearch) (2.x)	4m 9s
YAML Tests (Released OpenSearch) (2.10.0)	3m 19s
YAML Tests (Released OpenSearch) (2.8.0)	2m 59s
YAML Tests (Unreleased OpenSearch) (main)	4m 2s
YAML Tests (Released OpenSearch) (2.6.0)	3m 14s
YAML Tests (Released OpenSearch) (2.4.1)	3m 19s
YAML Tests (Released OpenSearch) (2.2.1)	3m 22s
YAML Tests (Released OpenSearch) (2.0.1)	3m 8s
YAML Tests (Released OpenSearch) (1.3.14)	3m 2s
YAML Tests (Released OpenSearch) (1.2.4)	2m 53s
YAML Tests (Released OpenSearch) (1.1.0)	2m 42s
	47m 34s

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