* extracted in-proc mode to #93124
* allow insecure conns in dev mode + refactoring
* removed ModeCloud, relying on ModeGrpc and stackID instead to discover if we're running in Cloud
* remove the NamespaceAuthorizer would fail in legacy mode. It will be added back in the future.
* use FlagAppPlatformGrpcClientAuth to enable new behavior, instead of legacy
* extracted authz package changes in #95120
* extracted server side changes in #95086
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Co-authored-by: Gabriel MABILLE <gamab@users.noreply.github.com>
Co-authored-by: gamab <gabriel.mabille@grafana.com>
Co-authored-by: Dan Cech <dcech@grafana.com>
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