tests: add a retry when asserting the up metric (#243) (#245) #107

Job	Run time
Run Tests / Get integration environments	4s
Run Tests / Lint Check	14s
Run Tests / Unit Test	37s
Run Tests / Check libraries / Lint	11s
Run Tests / Check libraries / Check libraries	28s
Run Tests / Integration Test (build and deploy) (seldon-servers-integration -- -k huggingface)	17m 10s
Run Tests / Integration Test (build and deploy) (seldon-servers-integration -- -k tf-serving)	14m 17s
Run Tests / Integration Test (build and deploy) (seldon-servers-integration -- -k mlflowserver-v1)	15m 18s
Run Tests / Integration Test (build and deploy) (seldon-servers-integration -- -k xgboost-v1)	15m 19s
Run Tests / Integration Test (build and deploy) (seldon-servers-integration -- -k sklearn-v2)	14m 12s
Run Tests / Integration Test (build and deploy) (seldon-servers-integration -- -k sklearn-v1)	14m 31s
Run Tests / Integration Test (build and deploy) (seldon-servers-integration -- -k xgboost-v2)	15m 0s
Run Tests / Integration Test (build and deploy) (seldon-servers-integration -- -k tensorflow)	13m 7s
Run Tests / Integration Test (build and deploy) (seldon-servers-integration -- -k mlflowserver-v2)	15m 7s
Run Tests / Integration Test (build and deploy) (charm-integration --)	21m 12s
Publish Charm / Generate the Charm Matrix	2s
Publish Charm / Publish Charm (./)	4m 17s
	2h 41m 6s

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