Get bucket name directly from path to avoid calling 'listBuckets' #1555

Job	Run time
build-and-test (ubuntu-latest, 17)	3m 58s
build-and-test (ubuntu-latest, 21)	4m 56s
build-and-test (windows-latest, 21)	5m 36s
build-and-test (windows-latest, 17)	4m 42s
build-and-test (macos-latest, 17)	4m 20s
build-and-test (ubuntu-latest, 11)	2m 42s
build-and-test (macos-latest, 21)	4m 3s
build-and-test (macos-latest, 11)	3m 42s
build-and-test (windows-latest, 11)	5m 25s
	39m 24s

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