Add pausing kb cluster database in namespace controller & fix get cost api #916

Job	Run time
image-build (database)	3m 2s
image-build (pay)	2m 13s
image-build (account)	2m 49s
resolve-modules	9s
image-build (minio)	1m 51s
image-build (launchpad)	2m 45s
image-build (exceptionmonitor)	2m 28s
save-sealos / save-sealos	18s
golangci-lint (./service/pay)	20s
golangci-lint (./service/launchpad)	26s
golangci-lint (./service/database)	29s
golangci-lint (./service/exceptionmonitor)	22s
golangci-lint (./service)	31s
golangci-lint (./service/account)	34s
build-cluster-image	0s
	18m 17s

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