[otlib] move reset_delay from CLI argument to config file
          #28512
        
          
      
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This CLI flag is unused and we want to set a reset delay for whole platforms at a time (specifically for QEMU which requires a longer delay).
This PR:
reset_targetintoreset(which uses the configuration file) andreset_with_delaywhich accepts an ad hoc delay.The default is still
100msso behaviour should be unchanged.Backport of #28509