Remove `preTest` action as unit tests are run by default #1401

Job	Run time
comment-notification	0s
lint / lint	1m 35s
prerequisites / prerequisites	1m 32s
License Check / License Check	1m 0s
build_provider / Build linux-amd64	1m 20s
build_sdk / build_sdk (nodejs)	52s
build_provider / Build linux-arm64	1m 37s
build_provider / Build darwin-amd64	1m 30s
build_sdk / build_sdk (python)	1m 2s
build_provider / Build darwin-arm64	1m 32s
build_sdk / build_sdk (dotnet)	54s
build_sdk / build_sdk (go)	1m 13s
build_provider / Build windows-amd64	1m 28s
build_sdk / build_sdk (java)	59s
test / test (nodejs, local)	2m 50s
test / test (python, local)	2m 27s
test / test (dotnet, local)	2m 38s
test / test (go, local)	1m 45s
test / test (java, local)	3m 16s
sentinel	2s
	29m 32s

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