Add pausing kb cluster database in namespace controller & fix get cost api #915

Job	Run time
image-build (database)	1m 52s
image-build (pay)	1m 13s
image-build (account)	2m 30s
resolve-modules	6s
image-build (minio)	2m 39s
image-build (launchpad)	1m 43s
image-build (exceptionmonitor)	1m 52s
save-sealos / save-sealos	37s
golangci-lint (./service/pay)	34s
golangci-lint (./service/launchpad)	23s
golangci-lint (./service/database)	23s
golangci-lint (./service/exceptionmonitor)	26s
golangci-lint (./service)	22s
golangci-lint (./service/account)	26s
build-cluster-image	0s
	15m 6s

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