feat(apps/web): fix loading checks on data retrievals

[rasitds]

Is your feature request related to a problem? Please describe.

1. There is no joint loading state in <SystemMessage /> component.
2. There is a need to update the if statement related to loading check in <TwitchBotForm /> component.

Describe the solution you'd like

1. <SystemMessage />: if statement can be updated for fix

   {!discordServerCount.isLoading ||
         !twitchChannelCount.isLoading ||
         !discordServers.isLoading ||
         !twitchChannels.isLoading ? (

2. <TwitchBotForm />: maybe it can be updated like this

   cfgData.isLoading || isTwitchAccAvailable.isLoading ? (
       <LoadingBox />
     ) : !isTwitchAccAvailable.data?.data ? (
       <Typography>Twitch account not found</Typography>
     ) : (
       ...