Add support for multiple test verbs and fix /_render/template. #1785

Job	Run time
test-opensearch-spec (version=1.3.17, hub=opensearchproject, tests=default)	1m 24s
test-opensearch-spec (version=2.0.0, hub=opensearchproject, tests=default)	1m 18s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=default)	1m 59s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=plugins/index_state_management)	53s
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 20s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=snapshot)	1m 3s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=dangling)	58s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=plugins/replication)	1m 12s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=plugins/streaming)	1m 7s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=plugins/notifications)	1m 15s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=plugins/query_insights)	1m 5s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=plugins/workload-management)	1m 2s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=plugins/analysis)	1m 8s
test-opensearch-spec (version=2.19.0, hub=opensearchstaging, tests=default)	1m 53s
test-opensearch-spec (version=3.0.0, hub=opensearchstaging, tests=default)	1m 52s
merge-coverage	9s
	21m 35s

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