fix(forwarder): validate destination bucket name #210

Job	Run time
permission_check	1s
prepare_matrix	17s
test-integration (./examples/forwarder-sns)	2m 29s
test-integration (./examples/logwriter-manual-subscription)	1m 53s
test-integration (./examples/simple)	1m 29s
test-integration (./examples/stack-http)	2m 26s
test-integration (./examples/stack-filedrop)	2m 28s
test-integration (./examples/logwriter-auto-subscription)	2m 36s
test-integration (./examples/forwarder-s3)	2m 41s
test-integration (./examples/forwarder-kms)	2m 34s
test-integration (./modules/config)	32s
test-integration (./modules/logwriter)	2m 18s
test-integration (./modules/stack)	4m 19s
test-integration (./modules/metricstream)	1m 46s
test-integration (./modules/forwarder)	2m 45s
test-integration (./modules/configsubscription)	58s
cleanup	9s
	31m 41s

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