Add correct After targets for prometheus_exporters

arch-audit hung as it was started before there was a working internet connection. To work around this issue, add proper Wants/After targets for network-online.target and for the rebuilderd textcollector let it start after rebuilderd.service is "online".

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added 21 commits

• ec982441...315fec94 - 20 commits from branch master
• 042ff9cf - Add correct After targets for prometheus_exporters

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merged

mentioned in commit 637cdb6c